I don't know what banning you're talking about. The topic I was talking about was user behaviour tracking.

They haven't successfully banned the main accounts associated with those using Google drive for piracy. ¯\_(ツ)_/¯

I am not aware of a policy at Google to ban accounts for storing pirated files. I only know of a policy to restrict the ability to share files with copyrighted content which the user has no license to share but that's an obvious necessity.