Probably because it's literally what YouTube is?
Why do you think a nation of free speaking individuals is patently not entitled to say what they want on a platform specifically created to allow people to say whatever they want?
To be absolutely clear on my position, I am not saying YouTube is acting outside their rights to censor content. But I am very much saying people have a right to be peeved about the bait and switch.
Further to my point. People being concerned about who and what specifically will be caught up in this is well, well within reason to bring into question given their current approach to takedowns which consistently missflag videos inappropriately.
"It's their business they can do what they want" isn't a valid argument against any of these questions, you're just stating a fact that doesn't answer or even acknowledge the potentially problematic situation at hand.