There are two definitions of free speech going around the internet discussion boards these days it seems. One is the legal one that has existed in our country since it was penned in the constitution, which protects you from government opression from publicly held opinions. That doesn't mean you can say whatever and expect no recourse from anyone, you have no protections from being kicked out of a private place or fired from your employer under this law, just that the State will not put you in jail or kill you over these words like other states around the world do for words. The other view is that you are allowed to say whatever you like on platforms like twitter and should not be banned. It has nothing to do with twitter. Twitter is not part of the State. People making it about twitter are missing the significance of the first amendment and what society looks like in places without protections on speech and religion from the State.
I'm not advocating for getting the government involved in forcing Twitter to allow all speech. I'm saying people need to stop continuing to use platforms that actively and publicly censor things on a daily basis, as if it's okay and normal now.
Fighting corporate-enacted censorship with government intervention is fighting fire with fire.