they moved to tech and become trillionarires instead of billionaires, I guess. I know we romantacize old Disney, but even some times in the 70's and 80's they were barely pulling it together. Art has always operated on thin margins

(which is exactly why Disney's biggest markets isn't entertainment. But that's a whole other rabbit hole).

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but to answer your question more directly: depends on your scale. a few (I literally mean "can count the number on your hands") small creators became billionaires over their work, a handful became millionaires but didn't try to expand it into some corporation. others live a modest life in the solid upper middle class.

Very few people are trying to be corporations, especially artists. the skillsets needed to be a business vs. an artist are almost orthogonal.