Twitter gets a lot of their value from all sorts of official accounts, many of which are government agencies. E.g. the last time I applied for a passport, Twitter was the only support channel available (they had a "live chat" page on their website as well, but it was broken). That's not right - what if I'd been subject to one of Twitter's arbitrary bans?
Is there a requirement to only use platforms that are available to all citizens? I imagine people can be blacklisted by ISPs and/or mobile carriers. Even a landline contract is not guaranteed, right? What they can't do is turn people away at various offices.
That said, I agree this kind of selective platform favoritism is (currently very minimally, but still) discriminatory. For example some people might not want to use Twitter for ideological reasons. (Let's say because it's a fucking cesspool that just generates tension.)
