Show me a game that uses the actual zmm register operations. The big thing is your game has to run at good frame rates without it, so there's little incentive to optimize something to use them, and if you do the speedup is partially mitigated by the throttling anyway. A lot of work for no gain.

In not saying you can't find something in a game to speedup with avx512, but that you wouldn't want to do that in the first place.