I guess you dont get the irony of using 'Lynch Mob' figuratively, because Parler was de-platformed for helping organize literal Lynch Mobs
It’s not the same at all, but it still leaves a bad taste in my mouth.
Legal action against the platform would have been fine.
Say it was Amazon suing Parler here. Amazon says that Parler is doing stuff Amazon doesn't like. Parler says tough cookies, we're still gonna do that stuff. So Amazon brings Parler to court. The Judge asks what Amazon wants to do about this. Amazon says it wants to kick Parler off. The Judge says 'Yes, the contract between you two says you can do that. Why the hell are you wasting my time? Read your own contract, what are you, a buncha pre-laws?' Parler is then kicked off.
Bad taste or not, Amazon (it appears) is well within it's rights to dissolve the contract with Parler (which I have not seen).