I'm asking primarily for the theoretical fps increase.
Technically, this is not a cheat, some online games officially support DXVK and there are no problems.
On the other hand, as far as I know, DXVK intercepts commands for rendering frames by the video card, suddenly Easy Anti-cheat can react to this and issue a false block.
Another problem is that I haven’t heard of a single case where someone could be banned for using DXVK, but that doesn’t mean it’s safe to use. I would risk checking, but I don’t want to risk my account and the money invested in it.