I don’t know of an instance where it’s not used as DRM. Maybe on F2P games since there’s no license management? Would be interested in knowing where you’ve found it isn’t used. And yes, more clarity on what is happening under the hood would always be welcomed by me. I do feel I have a decent grasp of things just because of my IT background and work with cyber security, but closed source software will always have its secrets.
Also, definitely like the play on words with your username lol. I have a domain that is a pun on my last name, so I always like seeing creative ways people use their own names.