Spacex satellites blockage was the surprise. How did they do it? I thought it would be the best dooms day kind of insurance. Turns out not.
RF and GPS jamming has been a solved problem for decades. As a SWE, we are all expected to take Physics E&M, Circuits, and CompArch in our CS undergrad - think back to those classes.
[flagged]
My wild guess is that jamming is local. Major cities may be fully jammed. To get an idea about GNSS jamming range (different signal of course, probably much easier to jam), there are maps online where you can see which parts of Europe are currently GNSS-jammed. But I have the same question as you.