How effective would this setup be if the parent company in the US is ordered to order the EU subsidiary to do something not in the interests of the EU?
https://en.wikipedia.org/wiki/Microsoft_Corp._v._United_Stat...
That's the entire point of setting it up like this.
Think of it like fast-food franchises. They have to sell the same food and use the same branding and charge the same prices. But if McDonald's tells you to start selling cocaine on the side, you tell them nope, that's not in the contract and I don't feel like going to prison.
I imagine that if a back door were ever discovered, AWS's reputation would tank so hard that a lot of companies would probably never do business with it again.
probably 100%?
Of course these services are backdoored.