Comment by brobdingnagians

Which gives two options in the market:

1. They don't exist, so if you own the game you still want it to work on your computer without maintenance updates

2. They still exist, so they don't want to have to update it every year because they can use that effort on making a new game and continuing to exist while still being able to sell from their existing catalogue because it still works

Either way it's in a game developer and gamers interest to have stable platforms