Given all the different ways “active” is defined we may as well just collect all the meanings available.
Mastodon and Twitter etc, for example, count logging on as active.
While I can see the argument for voting, it is qualitatively different from posting/commenting. Knowing both, as well as log in numbers too might make sense. But muddying the waters is probably confusing … though it is interesting that any instance can define what it means by “active”.