Indeed. I didn't took into account the possibility of having my access to AWS service cut off if there are some problems on the shop account side. Looks obvious now.

It is good that Amazon is protecting user accounts. But the way it was handled in my case is scary - writing just that my "account is closed", it "cannot be reopened" and it's the end, when I have a few sites running on AWS managed to frighten me ;) Maybe they would try to contact me before by phone if I didn't live in Eastern Europe, who knows?

Fortunately, an hour ago I received an email from Amazon saying that my account has been reinstated, so these few times I've contacted them about this problem have an effect.