>>723439670 (OP)
The only one that's actually managed to make the conversion from industry outsider to industry insider is... Toby Fox.
Nobody else who was the creative behind a gigantically popular game managed to capitalize on it in the same way. Next closest would be Scott Cawthon, but he kind of got shot in the foot by social turmoil (and by seemingly running out of ideas, but I still think his untimely donation to the Republican National Convention was the bigger culprit)
Then you have the list of one-hit wonders who are basically personally responsible for untold numbers of copycat games but don't seem to have any other good ideas themselves
Notch
Eric "ConcernedApe" Barone
Luca Galante (Vampire Survivors)
whoever made Slay the Spire