That problem can NEVER be avoided at any level unless you run absolutely everything (which is almost impossible).
What everyone does is have a system to quickly pass on and also shutdown who's 1 layer down. You receive a report and deal with the client.
> I was interested in building my own cloud
At the end of the day the problem has nothing to do with clouds. It happens everywhere e.g. if you rented out a house and someone did something illegal with it... how do you avoid it? All the same.