You're laboring under two misconceptions. First, that free speech is a "liberal" value, and second, that social media platforms are run to promote a "liberal" agenda.
The first is mentioned and protected by the Constitution, and often employed by Republicans and the right to defend and justify their speech and politics, so no.
>Are you suggesting twitter regularly purges
As soon as you used the word "purge" your bias becomes apparent, so I'm going to find a better use of my time. Good day.
Yes, they're often used interchangeably in contemporary American politics, but the traditional usage remains. Free speech is absolutely a "liberal value" - and for what it's worth, that's coming from an extreme libertarian that is diametrically opposed to most of the Democratic platform.
While I don't doubt his good intentions, I can envision many ways of how it will go wrong.