The measures you've enumerated (EU zones, encryption, etc) are mitigations for working with a potentially compromised vendor and should be done anyway. Not using the vendor is such a blindingly obvious countermeasure that one has to be either unprofessional or have a hidden interest to dismiss out of hand.
I personally choose not to believe a company which puts on its board of directors a well-known perjurer [1].
[1] https://www.theguardian.com/commentisfree/2013/sep/25/nsa-re...
Prove it
They say "We are sorry", give you some free credit, and that's it ?
"Sorry not sorry" and no credit.
You seem to suggest that every single employee that works at AWS is aware of everything that goes on with the company.
Isn't just possible that despite of what we know about the architecture, this might not be the whole truth and concerns about involuntary inter region transfers might just be warranted?
The problem I see with the DIY-attitude is that security is easy to get wrong and is moving target. The other opinion here is "keep it in the country". If someone really wants your data, the locale won't save you. And yet, if there is a breach, I could see an foreign company like AWS trying to hush it, where a German company would make a bigger fuss (diplomatic issue).
There is an AWS Region in Germany. Your data will stay in Germany unless you specifically decide to move it elsewhere.
AWS also provide you with the tools to encrypt everything and if done correctly means that Amazon no matter how "evil" they are cannot decrypt the data. Not only that, there is such a huge separation in access and rigour around governance that there is no way anyone within Amazon can simply login and see your data even if unencrypted.
Every single case of data being leaked from AWS is because the people working for the company that manage the data literally checked a box to make the contents public. Contrast this to "on-prem" where physical security can get compromised or the vendors of the physical hardware/software leave gaping holes or maintenance backdoors that get exploited.
Honestly these types of views are no more grounded in reality that flat earth conspiracy type views.