GOG tends to be my prefered source of games. DRM free and i have the option of making my own backups. I never felt the need to though. And i love the convenience of being able to download my games.
Because that is what the law and those licenses on the box say (the EULA if you remember the times when physical software came with a "read before opening" license agreements).
There was no licensing with any physical media I bought. It had the FBI thing and a piracy thing but my country isnt obligated to enforce that. They were legitimately sold in my country with no mention of a license.
Only recently, like ps4 times have I had to tck a box when playing a game.