Fucking W-LAN Routers work with 100mW to 1W Transmitter Power, but thats not the point. The frequency is.
And yes you could technically interfere with most WLAN Routers with much less Wattage when you just put them on top of your equipment.
Point however is that the microwaves Faraday cage is intact and woks normally, there are different norms for microwaves and Radio Equipment...
And you say Radiation, while it is A radiation, its not ionizing like UV or anything further down that part of the spectrum (like nuclear radiation) Microwaves, like Infrared are harmless to humans by itself (unless you get cooked by them but I've never heard about that happening)
My Microwave works absolutely fine and most microwaves do let some microwaves out, they happen to be in the 2.4 GHz spectrum, a more or less Obsolete standard besides Bluetooth and cheap wireless transmitters.
So why would it be broken? Please explain. And its not Radio equipment.