There are countless venues on the internet for your speech, but a platform deciding not to promote a wider broadcast of certain types of content is a substantially different thing than suppressing that content. The neutral default would be "let it be shouted into the void" which is not where we are right now; right now Facebook programatically promotes and distributes a lot of stuff to a far wider audience than we see it organically.

If you believe only hands-off platforms will last, then you have very little reason to be concerned with a particular platform's policy anyway.