So there are two issues here. One is, you buy a Wi-Fi device at the store and it spies on you and sends all the data to somebody else's cloud. That one's quite solvable with open source firmware. The other is, they're not using your device, they're using their own.

Restricting someone from having a device that can do that is basically a lost cause. Anyone could make one using a variety of existing commodity equipment or use SDR with multiple antennas. It doesn't matter what some future Wi-Fi device does in that respect because if it's their device they can do whatever they want. If that's your threat model you either need a law that bans them from doing that or a Faraday cage around your building.