As long as GOG keeps it DRM free, they will remain the only distributor that gets any more of my money, aside from direct, DRM-free sales by creators. Steam destroyed all rationalization I was using to be ok with DRM by locking my account for 3 weeks shortly after I opened an account.
I still don't really trust GOG after the whole "we're shutting down, too bad" PR stunt several years ago, but it's true they're a reliable distributor of DRM-free games which you can simply download and keep forever.