I think that is the biggest reason for the excessive safety as well. Just like all services try to be safe for those same things.

What do puzzles me is why those companies act that way. Is it because costumers are dumb enough to not differentiate "user generated content" from "a company endorsing such content", or their shareholders actively want to push such moral values?

Yeah that's rough. You have the most brilliant LLM in the entire world but someone asked it who commits 50% of crimes and suddenly you find your finding pulled.