[Veratyr]

IANAL but Google's ToS for copyright seem to be pretty safe so long as you don't share links to copyrighted content https://support.google.com/docs/answer/148505

> Respect copyright laws. Do not share copyrighted content without authorization or provide links to sites where your readers can obtain unauthorized downloads of copyrighted content. It is our policy to respond to clear notices of alleged copyright infringement. Repeated infringement of intellectual property rights, including copyright, will result in account termination. If you see a violation of Google's copyright policies, report copyright infringement.

Given that they cater to businesses, I don't think they could do automated scans.

[drampelt]

Looks like they do hash matching to automatically scan for copyrighted content: https://torrentfreak.com/google-drive-uses-hash-matching-det...

[Veratyr]

But they also only did anything with it when the user tried to share it.