After updating HA to 2023.02, I am getting “The automation “Motion Camera 2 (HO)” (automation.motion_camera_3) has an action that calls an unknown service: hangouts.send_message.” but the automation does not appear in entities or automations, and it is not in any yaml. How to find it and remove? I am pretty sure there are more like this.
Maybe you added via “packages” 
nope, via its web interface, this is for sure.
but lets assume it is via packages, how do I remove in such case?
Remove or edit the package.
I do not have the package installed, it is fresh HA setup with no signs of hangouts but with .homeassistant from older instance, grep points to home-assistant_v2.db.