Lunardowns was abusing bots and host glitches a week or so ago. I saw a video of someone getting ~1600 follows at once, and then they all spammed a discord link in his chat. I myself was only hosted by him once with 160 viewers that did not ever really show up. Best thing to do is just wait until twitch bans them. I heard there is a tool to remove known bot accounts but have not personally looked into it.