I fully agree with this. It will end up being a self-fulfilling prophecy for those arguing against true freedom of speech. When you deplatform a viewpoint entirely, then the people with that viewpoint are going to coalesce onto a much smaller platform, which will end up being an echo chamber for the viewpoints that the rest of the world desires to quash. Then, it will end up becoming an argument to prevent such echo chambers from even forming in the first place, which would effectively make it impossible for smaller players to get an inroad, as they'll just be preemptively accused of being inherently alt-right.
These people don't understand that, when you centralize control over avenues of speech like that, then one day that centralized control can do a 180 and start banning any type of speech, and not just "harmful" or "problematic" speech.
It's literally the same type of tactic that China uses to suppress dissent, just on a different scale (and with a different culture behind it). It's so transparent, yet the prevailing "public narrative" is still highly supportive of deplatforming.
Like Gab- can't use Twitter? We'll make our own echo chamber.
Them being on Twitter is bad, but being on their own platform is arguably worse.
Here's my claim- WRT to the internet, ostracism of extremists generally makes the social situation worse.(BTW, I really don't like it, either.)