Update: According to Epic's Tim Sweeney, the EAC team appears to still be working on supporting Wine and Proton themselves. When queried about it on Twitter, Sweeney said:
The team’s working on it, it’s just especially hard on Linux because the incredibly wide variety of configurations and inability to apply traditional digital signature techniques to custom compiled versions of the kernel, etc.
Original article below:
Recently we highlighted the ongoing unofficial work to get Easy Anti-Cheat working in Wine (so Steam Play Proton then too) and it appears another major step has been achieved.
We still don't know what the plan is, if any now, for Easy Anti-Cheat to officially support Wine / Proton and there's been no update from them directly or Epic Games on if it's going to happen. At least, not since they said they would work with Valve in Early 2019. With that in mind, this is very much a community-led effort from a CodeWeavers developer @Guy15241 with help from @0xdt0.
The ongoing EAC work is now at a stage where they've been able to get Dead By Daylight into a game, although with low performance (Guy mentioned 1FPS in the menu). They also shared some shots:
Hopefully EAC and Epic don't throw a spanner in the works, as they could likely at any point once this is released stop it working if they don't like how it operates. Which we highlighted Epic's Tim Sweeney talking about before on Twitter.
We're likely still quite some time away before EAC titles become properly playable under Wine and Proton and the code isn't currently public. It sounds very complicated how they're managing to do it all but it's interesting progress if EAC is blocking games you want to play on Linux under Wine and Proton. If / when code becomes public and / or there's builds available to test, we will let you know.