If anything, Lemmy devs should work on methods to obscure user identities, not expose them.

One of the biggest issues with the fediverse is very specifically how much user information can be exposed outside your home instance. As has been pointed out in this thread, it is very easy for rogue instance admins to set up quiet data mining instances.

It seems like it should be relatively straightforward for certain activities, like votes and telemetry, to be anonymized/tokenized for the purposes of federation, since that information all propagates outward from the home instance anyway.