Bots aren't really good for Twitch as a network. They don't provide meaningfully engagement or interaction, they throw off the algorithm designed to search for trending streams, and they consume system resources to broadcast data to clients that aren't using it.
But neither is the process of hunting and squashing bots necessarily productive. You'll get some number of false positives and load on your tech support staff. You piss off your talent base (because you're effectively demanding they take a pay cut arbitrarily). And the bot farms come back over time, through re-engineering or simple blind persistence.
impact to their sweet sweet equity of half their platform numbers vanishing overnigh
It's always been a game of liar's poker with advertisers. We pretend to show their ads. They pretend to pay us.
Presumably, Twitch wouldn't have done this purge if they didn't see an ROI in it - either from advertisers demanding a more authentic count for renewals or because the spread on these extra bot users wasn't enough to justify the server load.


Fair play to Twitch for biting the bullet and doing it - I remember Twitter, Reddit and many more committing to tackle bots, but I suspect that when top management see the data and impact to their sweet sweet equity of half their platform numbers vanishing overnight they suddenly have different priorities
save