I can confirm that a fresh install of Keybase on macoS is using Electron 22.1.0 which has not been patched and will go EoL on October 10. I find this very concerning from security software.
I can also confirm that a fresh install of Microsoft Teams on macOS is using Electron 19.1.8 which has not been patched and went EoL last November. A note that 19.1.9 is the last version of this train and includes at least two security fixes.