Yes, we saw the same thing. But when spot-checking the activity we realized it was super-low-effort legitimate activity. IOW, it could have been sweat shops or scripted bots going through some motions.
You still have to supervise the models and ensure they're working as designed and general quality control. Though with the number of 'Google disabled my account for no reason' posts, I assume they're not doing that, especially when I read comments like this, I assume its a part of maintenance that people don't consider when it comes to AI.
Google deals with abuse creation accounts in the tens of millions.