Sure, but GoG is a relatively new player and an exception in the market. Not to mention the vast majority of those games have had DRM removed by GoG, they originally shipped with it - including Cyberpunk 2077 and the Witcher games where this was done to prevent pre-release leaks.

Games much, much older than GoG used to have various ways of doing DRM, though to be fair some were laughably easy to bypass (codes printed in the manual and such).