Starlin had an injury back in 2016, To his hand, face and eye.
https://cosmicbook.news/content/thanos-creator-jim-starlin-hurt-sodastream-accident

I'd imagine he has a huge settlement coming from Sodastream.

In one videotaped interview, Starlin says he doesn't draw anymore, only writes, because his hand cramps up too painfully if he tries to draw.