What we're seeing here seems like a relatively new phenomenon, of private companies that are taking it on themselves to systematically erase entire schools of thought from the modern communications platforms, at least as far as they can. And yes for any given instance you can say, well, you can host your content elsewhere. And that works right up until Google - for example - steals your domain name on moralistic grounds, or your last remaining ISP or hosting provider gets attacked or comes under pressure from activists and so on. Because the sort of people who are doing this don't simply want Alex Jones off iTunes. They want him gone completely, from everywhere, and they will not rest until that happens.
Unfortunately Silicon Valley has long since lost any right to claim neutrality on political topics. That probably makes regulation inevitable. How long will conservatives sit back and watch as tech firms systematically attempt to erase their world view from the political conversation? How long will the wider population tolerate Twitter shadowbanning members of the government whilst doing nothing to an NYT journalist who (as noted above) says repeatedly she wants to kill all men, that she hates whites etc? This sort of extreme side-taking seems both new and very short-sighted. It cannot end well.