Assessing copyright implications is not "easy". It's a lot of difficult work that involves specialized expertise, judgment calls, and risk assessment. There are complex areas and shades of grey: derivative works, fair use, copyrighted but licensed materials, etc.

The main thing you are trying to avoid is causing harm at a level where an infringement claim is justified. There are a lot of uses which might look like infringement to an algorithm but which are completely legitimate.

> Check the files for copyright if you create a sharing link for them.

I just ran through everything on my Google Drive. Thank goodness I don't use it for much, though I do pay for extra storage. I don't have anything shared with the world, and only have a few files shared with a handful of family members.

But will this protect me? What is Google's policy with regards to scanning — do they scan only shared files, or do they scan the full drive because content might become shared?