It only took me half an hour to figure out how to find a specific branch base position here https://chromiumdash.appspot.com/releases?platform=Mac to download an old Chromium version from here https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Mac_Arm/ and test it. Oh, and also xattr -cr /Applications/Chromium.app to be able to run it 🙄