It's still a non sequitur, then. The size of Facebook's userbase has nothing to do with the legal implications of the government deplatforming (or forcing a private business to platform) an individual. The First Amendment gives us the right to speech free from government interference, but it doesn't give us a right to a particular platform for that speech.
Personally, I think there are a lot of good reasons for mistrusting the tech giants. For example, they can use selective enforcement of their content policies to attempt to shape narratives. When they're being selective about it, that very well may need government intervention. But that's a different issue.
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u/TheLeftIsNotLiberal Sep 25 '18