This is the most idiotic bs I've read today.
The cages never have been perfect and its absolutely no problem, its safe and doesn't even cause interference with the W-LAN, just shitty 2.4 GHz connections.
Why would it be broken? Please explain in detail why a microwave that operates with up to 2400W (im only using the 1200W setting) is broken when it causes small interferences with 2.4 GHz connections? Cause im like 99% shure even Modern microwaves that operate at these Wattage do that. Faraday cages are never perfectly insulating they are regulated to only leak a certain amount of waves for safety. Otherwise you wouldn't have a window in your microwave...