I’ve seen people talk about actors and artists that had a terrible time.
My own would be Anne Rice. She wrote Interview with the Vampire after her young daughter died of Leukemia. Then her husband suddenly died of a brain hemorrhage. I suspect her Christian, anti-fanfic phase was a result of mental illness and manipulation from the publishers, although I don’t think she ever apologized.
C.S. Goto.
He was one of the main authors for Warhammer 40k novels, but a couple of his books were…interesting…to say politely.
The fans tore him down and still consider him the worst 40k author, a decade after he left writing for them.
I genuinely feel for the guy, he helped create one of the biggest fictional universes, and was essentially bullied out of it for a couple duds.
If it were up to me, I’d give him short stories to stick in anthologies, or give him a “what if…” type series for 40k.