It's someone who doesn't understand how the fediverse works and thinks bot spam is a we should be grateful for.
If you ask one of their ~20 accounts, you may get a copy/paste reply about how it's somehow fighting lemmy.ml
None of it really makes any sense.
But they're obviously not going to stop. So I just block them anytime I see one pop up.
The problem with what they're doing, is the repost bots may post an article, and everyone who blocks spam bots won't see it. If ahuman account posts it, it may be removed because the spam bot made a post no one saw because everyone blocked them already.