Earlier quoted context omitted.
This threat is already mitigated by service contracts. AWS pretty obviously broke contract here, and will almost certain suffer legal consequences for that. Why they thought they could get away with it is unclear, but their rebuttle to Parler's claims is pretty weak.
But critical infrastructure is built on AWS. I don't understand how any CEO of any large company would be comfortable with the risk of getting the rug pulled underneath all of its critical systems given that this is just what happened. I think the reputational damage is, or at least should, be much greater than any Parler litigation.
If you are trying to make a case that Amazon arbitrarily pulls the plug on customers, Parler should not be your poster child. Amazon gave them 7 weeks of advance notice that their content was in violation of their agreement. Then they only severed the agreement once criminal activities were tied to the platforms content.
CEO's aren't going to bat an eye at this any more than they are concerned that YouTube removed copyrighted content.