Pservers had bots, but obvious pathing bots like Mages and Hunters would have not been ignored and investigated.
Blizzard didn’t do anything despite the rampant botting happening that was more than obvious. Sad that a skeleton crew of people on private servers did a better job.
Pservers had more motive as mentioned in this thread. Bots = subs for blizzard, while Private servers view them differently.