And why won't imgur suit your needs?
If I just wanted to post a photo in a normal post, Imgur would be okay.
But I run several RPG and Doctor Who forums, and all the banners and icons and backgrounds are hosted on my Photobucket account and Photobucket is no longer willing to host images this way unless they get paid an exhorbitant amount of money. I've already been paying them $39.99 USD/year for several years, so as not to have to put up with ads and there isn't any bandwidth limitations. Now Photobucket wants TEN TIMES that much, assuming you pay it in one lump sum. They want the amount I've been paying per year to now be paid per month.
There's no way I can afford that, nor can most other people who run small forums or who just want to host some avatars or banners there and use them on forums. So I need a new host that's willing to allow third party hosting for things like banners, icons, avatars, and smileys. I also need to make sure it allows private albums, since some of the smiley artists are only willing to allow me to use their images if they're not in a public album.
So far Photobucket worked beautifully - no privacy problems, I could set up specific albums, not an issue when hosting avatar contests on TrekBBS (easier to just store the entries in my own account rather risk the entries not showing up if the participant used a temporary service that expires after a short time).
Now, it's not going to work beautifully, and I refuse to pay that insane price. They've removed the lower tier accounts - it's either pay the $399/year or never share your images.
They're grandfathering accounts that were in good standing on June 1, 2017. We have until December next year to "upgrade" as long as our accounts are paid up.
I squeaked this by ONE DAY. My account expired June 2, and I had it updated and paid for another year not two hours after receiving their email. Then a couple of weeks later this whole mess was announced.