https://steamcommunity.com/groups/SteamClientBeta/discussions/3/3710433479207750727
some workarounds from this thread
linux:
lightwo 9 Dec, 2022 @ 7:19amchmod -x $HOME/.local/share/Steam/ubuntu12_64/steamwebhelper
windows:
lightwo 9 Dec, 2022 @ 7:19amremoving/renaming steamwebhelper.exe and starting the client with -noverifyfiles.
after quickly testing on linux (didnt test windows), games run fine, but you need to launch them through minimal mode and you won't be able to chat with people (and you will be offline), because that is handled by the now disabled steamwebhelper. also updates might revert these changes, but that shall be seen