The nice thing is though, it’s different for every server and from every server, so unless you follow a convention to say the user’s homeserver vote total is the definitive amount, then there’s no true karma.
My beehaw account is a great example. I made some comments on Lemmy world before it defederated. World and shitjustworks users can still vote on the old comments but they won’t count to my home total, and from Lemmy.world my vote total won’t change for that account significantly from that point. The vote totals on this lemmy.ca account will be different from lemmy.ca, beehaw.org or lemmy.world’s perspectives because the servers defederated can’t see the karma I earned on each comment on the other server, while lemmy.ca can see both.
Downvotes are also disabled on beehaw, so any downvotes won’t affect my total at all but could show on other servers.
Lastly, there are some servers with 40000 accounts and 3 active users (who post and comment), vote botting is feasibly a thing. Imagine if I made a Lemmy server at Rentlar.org and as the admin I made 20000 accounts who upvote me every where I post. I’d be the first user on Lemmy with 1M total votes, but would that mean anything other than I’m a somewhat tech-savvy narcissistic loser? No.