Platforms aren't there for your free speech, nor should they be. They're there for their own free speech, and freedom of association. Every platform bans content that is perfectly legal: spam, porn, gore, etc. Platforms like gab and parler ban "woke" content. Hell, even libraries pick and choose which books to buy, which books to put in the shelves, which books to put on display. Yes, this is really what we want, if we want a useable internet. Without the freedom to curate, platforms would inundated with so much spam, you'd never see the content you want.

Don't like it? Feel free to make your own platform that allows absolutely everything up to the line of legality! Just remember, nobody owes you financial success or a large user-base.