I refuse on principal to play DRM'd games … that is, anything from Steam. So, currently Rimworld can only be played if I pirate it, and while I've read good things from people who've played it, it doesn't really look worth my time right now.
From GoG though … if they go under, or I move under a rock and stop my internet, I'll still be able to play Kingmaker.
Not very well, mind you. But recent patches to 1.1.0i have improved things and I still get to keep my owlcat of +1 since I agreed to be a beta-tester (IE I bought it before it came out. Subsequent patches exceeded the size of the game, at this point, by about a factor of 3x).