Jarminx: Thanks for your answer and suggestion :) Just out of curiosity, what would be the point of DRM Free games if you agree to do just like any other game company like Steam or Origin or Uplay does?
To me the main point of DRM-free is that I can install and play the games even if the service and store itself ceases to exist (and also if I am at a place with no or poor internet connectivity; yes I play on a laptop). Even if the GOG store and service closed its doors tomorrow, I could still install and play my GOG games. My GOG games don't have an umbilical cord to the store/service (as long as I download the game installers to my PC before the closure; I've done that already).
It has nothing to do with me feeling that I am somehow more eligible to e.g. lend, give or sell my GOG games to total strangers (or even relatives) than I am with e.g. Steam or Origin games. The same rules still apply, even if GOG games have less (or no) technical measures to control that you don't do anything the store or the publisher doesn't want you to do.
Let's put it this way. Burger King says you can take as many cups of coke with your burger meal as you want (something that is different from e,g, McDonald's at least here). So they are giving you the power to take as many cups of coke as you want, so technically you could e.g. ask all your friends and total strangers to come near the burger joint and keep passing free coca cola to all of them, and maybe set up a place outside the burger joint to sell coke to bypassers, because you can obtain it for "free" from Burger King.
But should you do that, even if you could (e.g. BK staff doesn't see what you are doing)? Obviously not, their meaning was that you take only so many cups that
you can drink with your meal.
Of course it may a bit grey area and you might feel deviating from the rules might feel ok (to you). Like, at Burger King your kid sister wants a sip from your drink because she has something stuck in her mouth (a dildo probably), and you let her have a small sip, or at your home she wants to play some game from your GOG account, and you agree to install it on her laptop (in the same household). As a matter of fact that latter thing is apparently even allowed by the TOS, so one has to use their own judgement.