Based on the timing of the votes, I seem to have several dozen accounts that autovote my posts. In my experience at least, auto voters seem to mostly fall into one of three categories:
Those who autovote but check in at least semi-regularly to actually read the post, as evidenced by comments.
Those who “set it and forget it.” Occasionally even an extreme version of this. There’s one still-active account that I get small upvotes from that a few years ago I publicly accused (perhaps unkindly, but not inaccurately) of being a blatant liar and cheat.
The dead. Gone onto their reward, but their stake still votes. I think one of the hard forks made witness votes decay over time, maybe that could be done with autovoting too?
RE: Hive L2 - return of the bidbots