The issue is that when companies are able to get large enough to control the virtual town square, them censoring people has the same impact as the government censoring people. And especially given the fact that they’re all companies held by literally millions of people, who don’t get input into the speech allowed on the platform, allowing them the “freedom” to restrict speech how they see fit doesn’t make sense.
You don’t have the option to not use major platforms and have your voice heard, because they’ve done the work to make it virtually impossible.