The case in point was a single speaker being suppressed, not a "class", though. I don't understand why people keep trying to argue as if conservatives as a whole are being "suppressed". Most of them are still on Twitter (or here, or reddit, or...).

Parler was specific community with a specific set of inadequate moderation policies and became a center of thought for a violent community that ended up engaged in political violence. And that site, and only that site, thus became a target for broad suppression by other actors in the market.