Some people's hypocrisy doesn't undermine the core principle of freedom of association.
There is a lawsuit where a mining company owned an entire town, including the roads. A Jehova's witness won a lawsuit allowing them to distribute pamphlets there on the basis of free speech.
https://www.youtube.com/watch?v=lBozijndSLc
In any case, freedom of association shouldn't apply to online platforms. The average person isn't possessed by the illusion that any YouTuber's opinion is necessarily ratified by YouTube. If you don't want to hear someone's opinion nor associate with them, then you unfriend/block/unsubscribe. On the other hand, freedom of speech is very relevant from a practical standpoint.