Taking this to its logical conclusion, if you used the “login with X” feature (X being Apple, Google, Facebook), and you suddenly find yourself deplatformed, what are the knock-on consequences?
I don’t have a huge problem deplatforming itself. I do have serious problems when it suddenly cuts you off from other unrelated websites or paid-for assets. These knock-on effects aren’t immediately obvious and can be quite severe at the individual level (eg FB locking you out and now you can’t access the local Oculus content you paid for).
In my opinion, the solution needs to be a guarantee of transfering your account to another provider. We can do it with phone numbers, we can do it with banks (at least in Europe). I don't see a reason why we couldn't apply the same on social media and auth providers.
Banned from "login with apple"? I should have a right to transfer my account to "login with google/facebook/my own server" and it should work. The same way I can call my friend when he transfers his phone number to another phone network.
Trump banned from Twitter? He should be able to transfer his account to Parler and I should still see his tweets in my Twitter feed, be able to retweet it to my followers, interact with it, etc. Twitter wouldn't be able to influence tweets from Parler so it would show in timeline. But they could decide to not display it in proprietary parts of their system (search, trending topics, whatever)
This way we would prevent echo chambers and deplatforming, while simultaneously allowing companies to maintain their freedom to moderate their own space.
You might be interested in the "fediverse" then. One instance can ban you but you can make an account in others and still interact with people from your old instance.
I don’t have a huge problem deplatforming itself. I do have serious problems when it suddenly cuts you off from other unrelated websites or paid-for assets. These knock-on effects aren’t immediately obvious and can be quite severe at the individual level (eg FB locking you out and now you can’t access the local Oculus content you paid for).