Steam, Origin, Rockstar Social Club, etc... I refuse to use any of them now, although I did a few years ago. When I had issues with games, usually due to genuine and practical DRM problems that prevented me from playing what I'd paid for in good faith, or a hacked account in one instance, the customer support for all of them was about as much use as a chocolate kettle. I won't use any of them ever again.
As such, I vote with my wallet and certainly over the last three years or so, every game I've purchased has been via GOG. During that time, although my library is small by comparison to some of you, I've bought 169 games. I've only had to get a refund for one and customer support was very helpful. Likewise, the odd once or twice if ever I've had a technical issue with a game, they've always been pleasant and helpful in finding the right solutions.
That's enough to earn my loyalty and purchases. After all, I'm quite simple to please, all I want is to play and enjoy what I've paid for, not jump through hoops or troubleshoot problems because of DRM.
Certainly, it's a shame there are games released by a variety of studios and publishers that I would be interested in, for sure, but while they're accompanied by DRM, data mining software, or require constant connection online, given my negative experiences, I won't be buying them and I won't change that stance. Or at least, not until they're available here (or elsewhere) and DRM-free.