I suppose you can set up a Patreon account and people can send you money because you're such a cool person and definitely not for reasons related to your fanfiction activities
Someone tried that. They posted several chapters of a Harry Potter story on YouTube that consisted of pages of text that the audience reads, and it's a story about Sirius Black not going to Azkaban and instead being allowed to adopt Harry. I don't know if it's still going or if it got taken down due to a C&D (it would seem to violate the "fair use" clause that other YT videos have that review, explain, and analyze HP books and movies). Or I suppose the author could try to claim that it's a fan film (there are a few HP fan films on YT; the best one I've seen depicts the events of when Bellatrix Lestrange tortures Neville Longbottom's parents after what happened in Godric's Hollow with Harry and his parents). That one is a "fill in the blanks" short film of things referred to in the novels and movies but never actually shown.
The realm of legalities in fanfiction is a bit murky. Some argue that it falls under "fair use" as long as the author makes no attempt to profit. Others say all fanfiction is plagiarism and must be stamped out. In the case of Marion Zimmer Bradley's Darkover series, in the beginning she openly encouraged fanfiction and authorized a fanzine called
Starstone. I have some issues of that and a couple of other Darkover print 'zines. The early Darkover anthologies contained fanfiction stories that were edited for professional publication.
But years later... MZB read a fan novel someone sent to her that coincidentally covered the same events of the novel she was currently writing. Her agent and lawyers and the publisher insisted that she kill her book because the fanfic author was demanding equal writing credit when she found out that there were similar elements in both stories (considering they were about the same characters and same events, this was inevitable). There was no way MZB could prove she
hadn't plagiarized the fanfic author's work, so the book was dead. The fanfic author tried to revive it later, but other fans shut her down cold, even though it's a story we would all have loved to read. It will never be told now, even by the pro authors MZB authorized to continue the Darkover books after her death back in the '90s.
So the outcome of this situation with MZB was that word went out from her estate and literary trust that Darkover fanfiction was forbidden, not to be sold in fanzine format, not to be posted online, and any Darkover stories in private collections were to be destroyed. Any current writing had to be either destroyed or changed so it was no longer recognizably Darkover-related.
Well, screw that. I am not destroying the fanzines, nor will I destroy my own writing (I've written some Darkover fanfiction and even a filksong - none of which has been shared with anyone, but it's still
mine, dammit). There are Darkover stories on the fanfiction sites, but most are in non-English languages that I don't read.
This business of professional authors and fanfiction is one of legalities and liabilities and lawsuits. That's why there are separate subforums over at TrekBBS. Several pro authors hang out there and they never enter the fanfiction subforum. It's forbidden to discuss fanfiction or to even offer ideas or make requests for novels in the TrekLit subforum because that's where the professional authors hang out. One person forgot that rule, mentioned something, and next thing we knew there was an angry post from one of the authors who said he just had to trash the novel he was currently working on because it included elements of the idea the fan had just posted. He'd never be able to prove he hadn't plagiarized the fan's idea and couldn't risk being sued. So the book was killed, and weeks of work went poof.
There are a couple of the pro authors there who hang out in other subforums, and while it's not against the rules to mention fanfic in those areas, I do post a warning when I talk about it - something to the gist of "I am about to discuss fanfiction; pro authors should avoid the rest of this post". So far nobody has complained
Some pro authors get downright hypocritical over fanfiction. Diana Gabaldon is one. She ranted years ago in a blog post about people who posted
Outlander fanfic. But she conveniently didn't mention that her Outlander series was originally based on Doctor Who, and the male protagonist (Jamie Fraser) is modeled on one of the male companions from the Second Doctor era (Jamie McCrimmon). At one point she was even in discussion with the actor who played Jamie McCrimmon as she wanted him to play Jamie Fraser in the upcoming Outlander TV series. The actor was too old for the part by the time the show did finally start production, but he had a guest part later on.
(The premise of Outlander is that a nurse named Claire returns from France after WWII, she and her historian husband go on a holiday to Scotland, and Claire accidentally time travels back to pre-Battle of Culloden times. She meets Jamie Fraser and the political situation forces her to marry him for her own protection from the British. Further complications ensue when Claire later returns to the 20th century, pregnant with Jamie's child. Her husband agrees to claim the child is his as he doesn't want the scandal of people thinking his wife had an affair with another man and it takes him a long time to accept her story that she actually traveled in time rather than just ran off with someone.)
I mean, yeah, you can try but those are matters of law and intellectual property as they pertain to commercial transactions. It's hard to balance artistic freedom versus intellectual property but that is a separate discussion to "you can't change a character's race in any circumstances because author intentions". Obviously when actual signed and enforceable contracts are involved then that's a bit different.
Apparently there's some Harry Potter production in which Hermione is black. Rowling is okay with it. Emma Watson, who played Hermione in the movies, apparently wasn't.