Apparently the sun outputs radio waves in the THz-range, sub millimeter waves, so i dont think that this is anything to worry about. Also the strength of the radio waves comming from our devices is really weak, not at all in the suns level.
Excuse me if I still feel skeptical about mmWaves..
Both from a physics standpoint, as well as from a biological standpoint, they are not the same thing.
Both are biologically active, but for one of them we have adapted (Vitamin D production and photosynthesis, for example), for the other we have not.
From another perspective; the FCC limit for for microwave radiation is 10^18 times higher than natural background. That's a difference of a quintillion times.
Backround levels (green), compared to current exposure: https://pbs.twimg.com/media/Dt2NMoJU4AE2oYY.jpg
Therefore you can't really compare visible light exposure with microwave exposure. One has existed on the planet for billions of years, the other is completely artificial and man-made, and unlike visible light it penetrates tissues through the whole body, and there is no adaptation.
https://www.thelancet.com/journals/lanplh/article/PIIS2542-5...