There is no such a thing xyz went bankrupt because of cloud over provisioning. First of all we don't have the whole story from OP and I suspect he's not telling everything, second AWS will cover those accidents, third by default you can't create many resources on an account with default quota.

AWS may cover those accidents, and you can get the default quotas raised quite a bit. I agree that some info is probably missing here, but it's not entirely implausible.