>>100925820A while ago there was a change in the shape of graphs, and numggers insisted it must be a new generation of bots because what else could it be, and then it was revealed to be a change in YouTube's algorithm resulting in people entering streams in a different pattern as they progress. Since then I've been skeptical of many graph bot claims. I've also been in streams that crap out for a few minutes and then resume.
I would think if that graph was bots, they would rejoin a bit more gradually than that. That sudden dropoff, spike, and then equally sudden pickup looks more like an accounting glitch or some kind of fuckup that booted most viewers and then rejoined them.