I think you’re exactly right - it is the combination of money + little oversight that is the big problem. Warframe seems to do a good job with tennogen but they limit it to only cosmetic mods and seem to be pretty restrictive about what they accept into their store. I don’t see how you could have good oversight for a game with as many mods as something like Skyrim has.
The developer took that one down to focus on their health, they said. https://www.dexerto.com/gaming/only-up-creator-reveals-they-are-removing-the-game-on-steam-due-to-stress-2284288/