Usually they don't ban large organizations without some prior consultations. SMEs are victims usually. AWS/Azure and sorts know there will be no public recourse so they can cut without any notice. It's same with banks - if you are big enough they won't suspend you, but if you are SME they can suspend in a moment without any legitimate reason. They can suspend and say their "risk assessment team is looking at it" which is BS excuse knowing how banks work. At same time your contractors couldn't be paid and you can't receive money yourself.

I don't have an answer on how to solve that besides putting in law that any service provider vital for company operations (bank, telco, etc) shouldn't suspend or limit service rendering without court order. This is rather unrealistic and won't hit legislation because of same big organization lobby.