Quick hack to hide the full screen microphone dot on macOS 12.
To build:
git clone https://github.com/s4y/undot
cd undot
make
To run:
while :; do ./undot; sleep 1; done
The first time you run it, you might need to allow accessibility API access in System Preferences. Do this. You can ignore the message asking you to restart your terminal.