I noticed the 30 day bit too in an article describing the suit (after my OP). They may have grounds there, but if it were that simple why didn't Parler file a simpler suit that would get them back up faster and running for 30 days?

Admittedly I'm reading tea leaves here as not all the source materials are public yet, but most T&Cs for AWS-like services also have a termination for breach contract. Amazon has not responded yet other than to say it's meritless, but that does seem to be the strongest claim in the suit. I'd expect they counter it directly.

For what it's worth, I'm not an Amazon fanboy and am not really vested in my analysis as far as an opinion goes. I'm just weighing in as someone who has signed a lot of technical service agreements both as a vendor and provider. Their suit definitely feels like a longshot.