Games often use licensed third party assets like copyrighted music or various SW libraries for graphics or networking. That copyrighted content is licensed to t

Games often use licensed third party assets like copyrighted music or various SW libraries for graphics or networking. That copyrighted content is licensed to them for a fixed number of years. After that license period expires, they're no longer allowed to sell the game, unless they negociate again a new license agreement with whoever owns that IP now, which is often too much of a headache, and if they do renew it, it means a new release of the game for extra money to offset the new licensing costs. Emulation works around that since it relies on users who already bought the content from when the license was still in effect, but again, it's and effort from Microsoft to provide the emulation environment which is something the likes of Nintendo and Sony abandoned, since it brings little revenue for the extra costs. It's a lot more complex issue than just "all game devs = evil".