Maybe you misunderstood...yes, it's residence that matters. That's why I want a residence in the UK.
The service I wanted to sign up gives you a residence in the UK. Noone controls if you live there or not.
And if I have a UK DL I have an official ID document for the bookies.

The only problem could be the bank account.

There are some sites where I can sign up as a german citizen. But unfortunately almost all of them are taking a tax of 5%.
I'm value betting and arbing. You know what that means for these sites.
And the situation is getting worse from month to month.