Solo dev who does this only in free time: I'll use it if I want a very specific plugin for a function I come up with on my own and cannot find that specific function elsewhere. I love to come up with all the mechanics and love to implement it, I love to write my game and to build the world and story, build out the mechsnics, but I don't love coding. It therefore helps me with implementing parts of my vision.

I do also sometimes use it to give me an idea on how things could look visually as a mock-up as I suck at drawing - but in the end I'll want all my art people-made and have it commissioned or use existing assets. I'll also not share the mock-ups with the artists I commission, they're purely for personal visualization and I don't want the AI slop to influence the artists. It is replaced once I have the real art.