In that scenario Amazon would possibly suspend your entire account, or suspend all access to S3 (if you didn't respond). Or even if they only suspend the bucket

In that scenario Amazon would possibly suspend your entire account, or suspend all access to S3 (if you didn't respond). Or even if they only suspend the bucket in question, unless you're splitting apart your customers into their own buckets, the same issue applies where other customers go down because of one customer. I think it's better to work with a smaller company in these kind of instances. Larger companies like Amazon are going to just do whatever it takes to make the complaint go away. They don't want trouble.