That is utterly bonkers! Fun? yes, but makes winning way, way too easy - check the video from old Spuddy and sit back for an hour for the entertainment value
OK, so I watched the video (not like it was a big task; I'm a fan as well. Top-notch editing too.) I'll agree that the 1400% bonus is out of whack; that needs a serious reduction (90%) which I would prefer over a hard cap. I also think it would work well in tandem with buffing local tourists. But that particular game wasn't a great example of what usually happens (or potentially could happen) in a deity level game. I hate to cry "Youtuber Luck," but there were several things that happened there that just don't happen in most games:
1.) He was able to snag the Earth Goddess pantheon without using a meme tactic to get it (Gitarja/Peter/Mansa Musa with a suitable start, starting adjacent to two dye/tobacco resources, relic from a hut on turn 5, etc.) As the game has developed and more and more benefits are attained through high appeal and a heavy faith income, there's a pretty strong argument that this pantheon is the best and consequently usually the first to go. I find that if I'm not able to use one of these tactics and get the pantheon by turn 12 at the latest, it's gone. He was able to get it at turn 23, nearly twice as long, which is usually only possible when playing Emperor level or below. This fundamentally changed how the game played out as it gave him exponentially increasing faith income which he used to REX with a monumentality golden age as well as spam out national parks which was what won the game - perhaps they should switch back to 1800 cost or somethinig more suitable. I'd never accuse Potato of saying that the game is deity and then editing to a lower level, I believe in his integrity 100%, but in my experience this advantage is not attainable on deity without some serious map-luck or by picking a civ that basically unlocks the advantage.
2.) He was playing with Heroes/Legends on, and was able to grab both the resource planting hero and the resource eliminating hero. Without these, he would have had to reallocate a LOT of his resources away from faith and tourism generation and towards military conquest in order to achieve the level of luxury monopolizing that he had.
3.) While this is a fair tactic and quite achievable on deity, he had both secret societies and heroes on, went Voidsingers and took the Reliquaries belief. That belief may now need to be nerfed, as it originally gave a strong (300%) bonus towards something that was extremely difficult to come by - you'd be lucky to get one from a hut, maybe one if the right great general was in the lineup, if one particular city state was in the game and you found them before discovering too many of the natural wonders (and even then it provides 3 or 4 at best), or by suiciding apostles provided they have the right promotion available (which there are a few ways of ensuring.) And that's it, originally there were no other methods of getting relics. Now with these two game modes active, you get one every time your hero retires, and you can bring them back for presumably more (don't know, I don't play with heroes) and industrial level voidsingers provides a method of getting basically unlimited relics of the void (which his game was over before he had the opportunity to exploit.)
4.) In addition to the pantheon, wonders weren't built as quickly as usual on deity. Not that it played a big part in the game, but he was able to build the Mausoleum on turn 189. Again, that sounds more like prince than deity.