This is the reason I buy many games twice: once when they release on Steam, and again (if I loved them) when the come out on GOG, with Doom Eternal being the most recent example, but also Doom 2016, Skyrim, Dying Light, Tomb Raider, etc. I want to reward the devs with money for giving me a copy that doesn't need servers to run. It's work to produce it, and it has value for me, so I don't mind paying. CDPR is particularly good about this (obviously, since they run GOG), but the fact that such an amazing AAA company has this stance is amazing to me.