Hm, after doing quite a lot of research, the explanation of the strange phenomenon of the random MAC addresses might be the idiotic corona tracking system introduced by these sh*t companies Apple and Google, see
https://en.wikipedia.org/wiki/Exposure_Notification
Seems like this causes many cellphones to generate random MAC addresses, which probably show up as "unknown" and which return nothing when you enter these MAC addresses in a MAC address database in the Internet. I just did a test, in my quiet residential area I scanned for bluetooth addresses at around 2 p.m. (so in a time when people and their dumb smartphones are supposed to stay at home and not leave or come back from work), with a software called "BLE Scanner". I found ca. 10 unknown MAC addresses. At ca. 3 p.m., the number of unknown MAC addresses increased to ca. 40 unknown MAC addresses. So this would fit the pattern that the tracking apps randomize their MAC addresses every 15 - 20 minutes. So at the moment, it looks as if the explanation could be corona tracking and tracing apps. If I find out anything else, I will write it here.
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