Except that games are executing code on your general purpose computer. They are also connected to the internet these days.
When I buy a DVD, I can view it with my own software or on a dedicated device that is not a general purpose computer or connected to the internet.
I suspect that most people who try to carve out an exception for games are just rationalizing. They prefer free software, but don't want to give up their games. Then they often poo-poo someone for not wanting to give up $OtherPropreitaryApp.
The idea that you couldn't hide some kind of code execution exploit in a dvd-playing software and that anyone ever audits their video decoding hardware-software chain in a rigorous manner is also a rationalization.
When I buy a DVD, I can view it with my own software or on a dedicated device that is not a general purpose computer or connected to the internet.
I suspect that most people who try to carve out an exception for games are just rationalizing. They prefer free software, but don't want to give up their games. Then they often poo-poo someone for not wanting to give up $OtherPropreitaryApp.