I always grab extra copies from other stores/clients when they're free, just in case it might have No DRM or No Denuvo - i.e. Arkham Knight on Epic.
Not to forget: You never know which company will go out of business in a few years. I had to learn that lesson with the Telltale store ...
Definitely this too.
You never know what stores will stick around, what games have DRM or not, or whatever.
So, yeah - to be safe, if it's free or cheap, grab the extra copy!
If it's free, it's for me! :)