At the moment, it seems like it's not being done yet, bots emulating people. I suppose the benefits would be that if you get added, you appear on the feed as well as on global. So far, they just have bots register for an npub and absolutely carpetbomb the global until they are blocked by all the major clients. And then repeat. Many clients now do an abridged global feed which is a network consisting of "your friends, and friends of friends, and friends of friends of friends." Because of this, bots will soon definitely have to adapt to be added. But I haven't seen anything sophisticated at all yet.