And that's why no one is talking about forcing GitHub and Gitlab to do anything. They're merely complaining. Just because someone complains about something doesn't mean they think it is illegal or ought to be illegal.
Yes, but one by one the word "censorship" loses it's meaning. It used to mean preventing people from publishing their work. Now all it means is disagreeing about what should get shown prominently on social networks.
Anyone suppressing a work based on ethical judgments is practicing censorship. They could be acting on the authority of a state or religious institution, they could be removing immodest young adult fiction from the shelves at a children's library, or they could be moderating the content of a web site. Web sites are new, but the concept is the same as it's always been.