For me, there's no difference between Origin, Steam, Uplay or Windows Store. I don't mind trying free games from any of these services and very rarely do I pay full (or even half price) for the products they are selling.
There is a big difference, one is owned by the company who makes the operating system and exercises a great deal of control including deciding whether or not to even allow those aforementioned applications compete on the Windows Store in the future. Microsoft also has a lot of control over the direction the market will move in the future and this exactly because they basically forced and frontloaded their own store. A more apt comparison of "DRM game stores" would be all of those services and GFWL which largely failed because Microsoft had to compete fairly and basically wasn't interested in putting in the effort.
People who continually make this erroneous comparison must be trying to NOT see the difference. It's blatantly obvious - the comparison doesn't pass muster under even the tiniest of scrutiny.
“The greatness of a nation and its moral progress can be judged by the way its animals are treated.” - Mahatma Gandhi