I mean sure. It’s probably done in some extend. But on most posts it’s just not worth the trouble setting up a whole bot network, just because you don’t like to post of 3volver. And you could build a similar bot network for pretty much every other social media platform, so it’s not realy worth to invest that much time in altering the upvotes of a lemmy post. Lemmy beeing a network most people never even heard about.