That is a really wild design
“The concept for the device emerged from social research conducted in six countries, which identified a need for digital communication among youth. … a radio protocol was patented. This protocol allowed up to 3,000 Cybiko devices to form a network without using auxiliary stations.”
Fascinating!
Smartphones can form mesh networks with WiFi, but neither of the duopoly OSes have this as a built-in feature, it's left to apps, and that fragments the potential. The most powerful radio isn't user-controllable, it's strictly pay-to-play and operating a base station is heavily licensed, no peer-to-peer activity is possible.
This is something I'd like to see disrupted, although I'm not holding my breath. I don't like that grid failure or (more likely) government order can knock smartphones off the network so easily as they can.
I was never directly involved with said project, btw, but I knew all of the people who were. Nowadays, I live near Amsterdam and will get 1 gbit symmetric fiber internet soon (most of NL already has access to it). I use a Wireguard tunnel to connect via any network (LTE/NG/WLAN) via my home network which runs Pi-Hole. My point being, security has improved, but there is a constant: wireless internet usage can be triangulated, eavesdropped, and clients can be tracked. It is something we need to live with. Every time I leave my smartphone at home even for something as small as picking up my kids at school or sports I feel good. However I can easily be tracked by all the doorbell cameras in the street.
We are done with subversion on the internet. It is over, a done deal. I've given up many years ago, and eventually I also embraced the thought of such. If you want some private time together go to some cave in Turkey or whatever.