Freedom of speech, at least in the US, is a concern specifically with the government censoring citizens' speech. The Twitter files are a recent example of the government partnering with private corps to censor, so that's a fair argument, but in general a private company can't violate free speech by deciding what kind of content they want allowed.
Is it shitty that they censor? Absolutely. But is it a constitutional violation? Not unless I've horribly misunderstood my rights for more than 35 years.
Is it shitty that they censor? Absolutely. But is it a constitutional violation? Not unless I've horribly misunderstood my rights for more than 35 years.