You really don’t believe AMD sponsoring these games has anything to do with it?

Ease of implementation in most cases can’t have anything to do with it, because most games don’t even need to do any work to enable it. DLSS support is included in Unreal and Unity, right alongside FSR. They’re both just checkboxes. Being open source has nothing to do with choosing to enable one but not the other. Trust me, as a developer, a library being proprietary means very little to us when building a video game.

AMD isn’t your friend anymore than Nvidia, they just want you to think they are because they don’t have an abusable market position yet.