It’s confusing because of USA, if they applied what everyone in the world uses it wouldn’t really be a problem.

How does DRM(Digital Rights Management) that has as function the blocking of copying or “blocking non legitimate access” of copyrighted media prevent cheating?

Because that is far different as things like access to tests answers, because that is not the same than copyright.

What good reason would an educational resource get to have tons of DRM?

Socialist constitution means they have in there provisions to impede the private ownership of the means of production.

There’s also itch.io.