alt Hacker NewsHow is that achievable? PIs can legally do it. Random people can keep tabs on you and exchange gossip. It's the sudden scale and low cost that doesn't sit well with freedom to not be tracked in public 24/7 we took for granted.
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If PIs can "legally" do it then it sounds like there is a law which allows them to do it. That law can be revoked (unless the power comes from Constitution which would make it effectively impossible to revoke).
Note that PIs are effectively illegal under GDPR by default. They would generally need to provide Article 13 notice, i.e. you would become aware of them unless they were just asking around without actually following you. Member states can make them legal though (via Article 23) and likely in many cases they have done so.
It's not achievable.
The only way is through - everybody should get into the practice of stalking and gossiping about each other in a Molochian environment, where the people who do not do so suffer from the losing side of an information asymmetry.
Expect AI, especially post-Mythos, to just enable this at even further scale. Consumer grade wireless networking gear as a whole is a very wide attack surface and is basically never updated.