I am one of those, who don't boycott Steam.  
 I did "boycott" it in its beginnings, though.  
 I was successfully ignoring Steam until late 2009. 
 That was when they gave "Portal" away for free.  
 I made my account literally "five minutes to midnight" (
the time the free offer endet), after I considered all day long, whether the game was worth the hassle (
spoiler: it was!).  
 While I appreciate the DRM-freeness of GOG, I don't want to miss out on some of the modern games.  
 In 2010 I searched for an old game, and stumbled over GOG.com.  
 Origin came next - by "accident" - I bought a game, and only found out after the purchase, that it was an Origin key.  
 Then came Uplay...I backed/preordered Might and Magic X...and that required Uplay.  
 So - I use all the "big" digital distributers, and, so far, encountered no problem with any of them.  
 But I can also say: of all the DDs, GOG is my most used, and my GOG shelf is better equipped then all the others together.