Bethesda tried this when they attempted to monetize mods. You can’t stop the signal on truly user-generated content. At best they might have a copyright claim on official DnD lore or monsters, which can be sidestepped with a custom setting, which is pretty much the whole point of user generated content.
Check out Shapez 2. The first game was pretty basic but I really enjoy S2 as a Factorio lite. It’s much much less complex, but there’s still plenty of room to build crazy contraptions as you unlock more stuff to build with. Most major upgrades will make you want to refactor your whole base, but after you finish delivering a certain type of shape you no longer need to make more (except sometimes as components for new shapes). So I’ll pretty regularly knock out like half my factory and make a new and improved assembly line for the new shape I need to deliver.
It’s good, give it a look. I get quite sucked into it and it doesn’t have as much mental overhead as Factorio does. There’s also no biters, which makes it a much more relaxing factory game.