That's a rather ridiculous analogy, it's like claiming that if you drink a whole water tank you will die therefore water is dangerous and you should avoid it. Yeah, Bluetooth and microwave ovens use the same frequency (2.4 ghz), but the similarities end there, wireless devices use very low power, Bluetooth devices are mostly between 1 and 100 milliwatts, while microwave ovens go 700 ~ 1000 watts, meaning BT devices emit at most 0.001% of what an oven does. Dosages must always be taken into consideration.
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This I agree with wholeheartedly. Sure, they can be dangerous if used too much, but I rarely do some of that stuff anyway.
Water molecules have natural rotational and vibrational modes in the microwave frequency range. WiFi and Bluetooth use this range too.
Microwaves heat food by matching the frequency of water molecule motion, causing them to rotate and heat up.
This heating effect is a thermal effect, they cannot ionize atoms or molecules directly.
Higher frequency electromagnetic waves carry more energy per photon, which can make them more dangerous in terms of ionizing radiation (like X-rays or UV light) that can damage DNA and cells.
Lower-frequency microwaves require much higher intensities to cause harm, and only through heating.
