And the idea that criticizing censorship when private organizations do it is “whining” is quite odd. Not everything bad is illegal. Lots of people criticized the Hollywood Production Codes as bad censorship, even though it was voluntary. Except back then it was liberals complaining that the Hollywood companies that controlled distribution were using their power to entrench conservative ideas and suppress liberal ones: https://www.wsws.org/en/articles/2018/05/17/cens-m17.html
No one ever stopped people from making the films, they only disallowed the distribution and showings via their operations. The Gov, banning a film (porn)was censorship by the Gov and thus was struck down by the Warren court. But you know that right?
They obviously can choose what content they choose to host and display. That is their right as long as it is not discriminatory or in violation of US law. While that is the literal definition of censorship, the issue is not about a free market is it? Nope. Is about the Right whining that their hate is not allowed to be amplified, hence they call it censorship. They, not me, are the ones stating that this is a free speech issue. I state it is not. Explicitly not.
Its a really simple concept. I am surprised you dont understand.