[qolop]

It's definitely not a slippery slope. Firstly it's a drop in the ocean for cloud providers. Secondly, there's some effort required in establishing whether it was a case of stolen credentials or not. Not everyone is going to put in that effort to lie. And finally, you're forgetting that most cloud users are enterprises and small business that have some moral compass and aren't going to lie to the cloud providers to their face.