Oh nice, does the lemmy_migrate github code cause federation to occur if we use our alts from the respective instance? It seems it should since it triggers subscription… Let me test it out and get back to you.

What counts as an active user? Voting? Commenting? Posting?

Submitting a comment or post. AFAIK upvoting/downvoting doesn’t count, at least for Lemmy’s numbers.

Kbin is looser with the definition, I think they even count accounts that simply vote among active users.