Because you aren't being "censored" by billionaires at all. They have made the business decision to reduce the usefulness of their AI to prevent their liability from being legally, or even socially, held accountable.
Again, consider my example about YouTube - it's not illegal for Google to put pornography on YouTube. They still moderate it out though, not because they want to "censor" their users but because amateur porn is a liability nightmare to moderate. Similarly, I don't think ChatGPT's limitations qualify as censorship.
Okay, i mean you can say censorship isn't censorship if you want? This is my point, why are you treating limits placed on your expression/sharing/information differently based on what type of person is doing it?