I’m pretty sure I know what I am talking about I manage my own homelab and know this kind of stuff. sure I am not an expert but I still have experience in it. But your argument that nearly “all” of them have is just wrong. There are exceptions of course however not all Devs practically target a group that have a network wide DNS blocker installed. The amount of users would probably be way less than 1%.
This is true I wanted to play magicka 1 with friends but he couldn’t launch it on his windows pc while I could launch it without any problems on Linux