That is quite a lot of interesting experiments, thanks for introducing. :)
I'm inclined to add one more:
51: monitor the radio spectrum for drones (and if their signature looks hostile, warn people about them) - there's a DIY recipe for a monitoring station out there somewhere, and some Ukrainian guys scan their sky using HackRF
SDR is definitely a technology worth learning. I'm already a happy user of RTL-SDR, but if I want to really see what my WiFi is doing, I should get a HackRF eventually too. (Note: WiFi is too fast to intercept without loss, except with another WiFi card, unless a slower bitrate is deliberately chosen.)
It is sad to see those people arrested and put away for acts of public defiance. They could have burnt down something and fought another day. :(
Some day, at some point, some act of defiance will trigger a revolt - maybe a revolution - but that time doesn't seem near. Covert attrition seems many times more effective currently.