Comment by grishka

What Apple probably doesn't want you to know is that you can also run these two commands to disable the notarization requirement, effectively reverting your security level to non-paranoid pre-Catalina:

    sudo spctl --master-disable
    sudo defaults write /Library/Preferences/com.apple.security GKAutoRearm -bool false

This reveal add and select a third option, "any source", under "allow applications downloaded from".

The setting will still occasionally reset after installing some system updates because it's 2023 and computers these days are extremely unreliable when it comes to remembering user preferences.