Looks like Steam wants to eliminate competition.
I don't know if it was implemented immediately or its to be implemented at a certain date.
Essentially if you buy a game, your being asked at that point, if its for yourself or a gift?
If its a gift, you can hold on to it then sell it or pass on at a later date? Now Steam want you to gift it to the individual at the point of sale.
Not that I was a fan of G2A but RIP