Who has lost the ability to speak freely online? The only people who have been banned from speaking are a few high profile people who broke the T&Cs, and were recognized for their toxicity.

This is deplatforming -a platform-, not those people. Every individual on Parler can go create accounts and post on Twitter and Facebook and etc...unless, of course, their toxicity causes them to be banned there.

Nothing legally, or fairly, forces one platform to host another platform.