Can the fact, that I'm logged in to, say, a server in Hamburg, be a hint to where I live and be used to identify me?
No, for two reasons:
- The next best suited server near your real location is not necessarily the one, that is really located next to you. It could also be a server hundreds of miles away, because the keyword is 'load balancing' for maximum performance. If a server farer away is better suited, then that's the one you will be assigned to.
- Nobody can tell a free user from a paid user - so nobody will know if you have been assigned a server or logged in to the same server from a different country.