I think Stop Killing Games is more important than just "oh noes, they took my toys away". Looking back, video games have been the gateway to computing in more than one one way. Before home computers people had game consoles (which were cheaper than computers) or arcades. Before iTunes and app stores there was Steam. Before the modern smartphone apps there were Wii channels. Maybe in some cases the games came technically later, but they were the initial contact for the broad masses.

What I'm getting at is that it has usually been through games that practices in general computing have been established. If Stop Killing Games is successful it will have much bigger effects on general computing. And I believe that this is why you keep the same false accusations getting repeated over and over again (e.g. saying that SKG would require publishers to keep supporting a game forever). I know it's said not to attribute to malice that which can be adequately explained by stupidity, but at some point the pattern becomes too clear not to notice. All of big tech stands to lose eventually if SKG succeeds.