Every week there's a front page story on HN to the tune of "X froze my account and won't tell me why, and their appeal process is totally opaque."

I think that to some extent, the availability of multiple providers, and the risk of getting kicked out, are the long term remedy. People will figure out how to mitigate sole-source risks. There might be a risk-reward tradeoff, i.e., the most desirable platforms from a short term profit standpoint might carry the biggest risk of getting shutdown. There will always be somebody who will let you in, at some level of service and security.