What you're missing is range scales on square of power (or is it twice that for radar? I would think so) and all known forms of radiation have bio effects that

What you're missing is range scales on square of power (or is it twice that for radar? I would think so) and all known forms of radiation have bio effects that scale by linear dose. So the 60 GHz presence detector transmits at +6 dBmW aka 4 milliwatts or 4 thousandths of a watt. As a side note microwave RF has never been known for power efficiency and I've built many a MMIC amplifier running under 1 percent efficient LOL. Something like a patriot missile AN/MPQ-53 radar transmits at 10 kilowatts, which is 2.5 million times the power of these detectors. If you want to burn thru radar jamming at 350 miles or whatever the unclassified spec is for the -53 radar, its going to take some serious wattage. Of course that's nothing compared to an old fashioned UHF broadcast transmitter or even a modern FM broadcast radio transmitter. Anyway the point of the above is in theory if RF caused cancer or death or covid or whatever its being blamed for now, the "medical signal" would be 2.5 million times stronger in military anti-aircraft units than in rando presence detector general public, to a first estimate. Seeing as there's no difference in death rates for ADA soldiers vs artillery or any other army branch that I'm aware of, and the rate would be 2.5 million times lower than... nothing... for general public using presence detectors, it seems unlikely that even massive scaling up to a billion users would have a measurable effect. Similar comedic examples can be generated for broadcast engineers. I'm friends with a couple broadcast EEs and old broadcast engineers just don't die (LOL). If a cellphone (100 times the power of a presence detector) gave even one human being per year early cancer, your average broadcast engineer would be dead in their first five minutes of work or something like that because they're always screwing around with enormous power levels, no matter if its permitted or not technically. The thing about electronics, is much like radiation, we can generate and measure sources over 9, maybe 12 orders of magnitude every day all over the planet.