I tried many things trying to get easy anti cheat to work, including:

• Installing a distro that uses glibc 2.35 (fedora 36)
• Installing a distro that uses glibc 2.36 (fedora 37) and manually patching, compiling, and installing glibc with the patches in the glibc-eac repo
• Trying all proton versions on all above combinations
• Trying -noeac in the launch options with all above combinations
• Trying heroic games launcher with lutris

To even run on fedora, the glibc-eac repo needed a bunch of tweaking, and in the end I wasn't able to compile glibc with that repo successfully. However, I was able to manually apply the patches to the newest version of glibc, then compile and install it, and yet I still got EAC errors when I tried to run DKO.

To get it to work, I had to install an arch based distro (manjaro 22.0 in my case) and then run the glibc-eac.sh file. I just needed to install the base-devel package to get it running, no extra changes.

Once that finished, I set the proton version to experimental and bam, it started, loaded, and allowed me to play online with no EAC errors.