I don't agree with this - even for businesses there is always a limit over which there is serious trouble for bottom line. I think cloud providers should allow

I don't agree with this - even for businesses there is always a limit over which there is serious trouble for bottom line. I think cloud providers should allow one to set a hard cost limit over which everything shuts down. For personal projects the limit might be $100 and for small businesses $100k, but even rich companies have it (not the same reason, but Knight Capital comes to mind).