> There's no due process, no way to defend yourself, no way to get them to show how they made their decision. As I understand it you have no rights beyond the ToS.

This is where legislation is required. Mass-scale social media/cloud providers/etc are effectively public utilities, and you should be able to challenge their decisions in court - the current situation is as bad as if the electricity company could disconnect you for non-specific reasons and you had no reasonable prospects of a successful legal challenge to their decision.

(Such regulation should be limited to providers above a certain size-maybe a cutoff like 10 million MAU or 500 million annual revenue-so small players aren’t burdened by it.)