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I don't know which game implements it but the Nintendo Switch's system license lists FSR as one of the libraries that it uses. So I guess even Nintendo Switch supports it.

Steam deck supports FSR 1, which is basically unrelated to FSR 2 and DLSS.

Steam deck also supports FSR2 just not globally like it does FSR1.

For FSR2 you need game-specific data so it's dependent on the game developers to adopt it.

What is the cost (in both time and money) of having to run every patch and update through Nvidia's upscaling service?

That isn’t a thing in DLSS 2.

It can even be implemented in consoles version of the game.