What are the consequences for configuring torrc to exclude german / US tor nodes?

Looking at the tor nodes bubble graphs, it is clear to me that an adversary is trying to run as many german tor nodes as possible for nefarious purposes. What can we do about it?

From a serverside point of view, how about running hidden services that are excluding all german tor nodes ? would that harm your anonymity at all ?

Just curious if there are some actual studies on that, or if it’s only people’s opinions so far

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Looking at the torrc docs:

The following options restrict the nodes that a tor client (or onion service) can use while building a circuit. These options can weaken your anonymity by making your client behavior different from other Tor clients:
ExcludeNodes