It is very good these things are getting publicized. More and more people realize these payment schemes for what they are: a scam. Every cloud provider that refuse to put a hard spending limit participates in this.

It is important to remember that not all cloud providers participate in it. For example, in Hetzner Cloud, they explicitly provide the maximum amount you are going to pay for a given instance or service in a given month. You are guaranteed not to pay more. Everybody knows why Amazon etc. refuses to do it this way.