I don't really play Siege (tbh I used to play exclusively PvE and spent lot of time exploiting map quirks and bot behaviour to "max" out the highest possible score in THunt lol) but installed it because they added DLSS 2.2 to the game. The DLSS implementation itself I didn't find overly impressive (I can generally push 165 or close to it at all times at VHigh/Ultra native 1440p), but I wanted the .dll. Between 3 DLSS 2.0 implementations:
The Siege .dll is the newest, 220.127.116.11.
The MW2019 .dll is 18.104.22.168.
The War Thunder .dll is 22.214.171.124. It's also about 3MB smaller than the others.
It doesn't look like they go back and update the DLSS component at all. What you get at launch appears to be what you get.
The 2.2 .dll is a direct replacement for MW2019, so far doesn't seem to be any issues, but I don't play the slightly more demanding Warzone part of the game. Half of me wants to say that there's a slight IQ improvement when character is in motion (almost like they did a bit of sharpening specifically for when char is in motion), other half of me says there's no difference. No real improvement to performance.
The 2.2 .dll doesn't work for War Thunder. The game still runs all the same, but the graphics menu no longer has a dropdown menu, just a box that shows the "Off" setting. Not a surprise, of course, due to Gaijin being a dumpster fire, the game engine being a dumpster fire, the game always being a buggy dumpster fire, and the DLSS 2.0 implementation being a dumpster fire. Not a loss for me, since I always just run native @ 120fps capped.
I could also test No Man's Sky now with DLSS, but I long since soured on that game since the much-lauded-by-everyone (Origins? I think) update unilaterally broke half my bases by changing the world biomes from temperate to perpetual biohazardous storms.