I kept Bambu Studio around while I was trying out Orca Slicer but finally just uninstalled it. Sorry, Bambu — still don't trust you. Also, Orca is just better now.
So that's a complete and total removal of all Bambu software/services from my Bambu printer. No longer using Studio or Handy. No cloud — printer is in offline mode (and blocked from the internet), with print monitoring via Home Assistant and/or the 3rd-party Bambu Connect app.