The receiver of the C&D should see a lawyer about what changes or user-facing messages might get Bambu to back off. This is a normal, solvable business disagreement, not an excuse for everyone to get their pitchforks out again.
Also: I run multiple Bambu printers offline and they all work fine via sneakernet without anyone's files going anywhere. People should stop acting like these devices are bricks when used without internet access.