Apartment WiFi congestion is unsolvable — 40+ networks on 3 channels

Apartment dwellers in dense buildings face an unsolvable physics problem: the 2.4GHz band has only 3 non-overlapping channels, and a WiFi scan in a typical apartment building reveals 30-50 neighboring networks. Each network's traffic creates co-channel interference (same channel) or adjacent-channel interference (overlapping channels), reducing effective throughput by 50-80%. So what? Even with a brand-new WiFi 6 router, apartment residents get 20-50 Mbps over 2.4GHz despite paying for 200+ Mbps plans. So what? Devices that only support 2.4GHz (IoT, older laptops, printers) are essentially unusable during peak evening hours when all neighbors are streaming. So what? Users upgrade to expensive WiFi 6E routers hoping 6GHz will help, but 6GHz doesn't penetrate their apartment walls to reach the bedroom. So what? The resident is stuck with slow internet in a dense building with no solution other than running Ethernet cables — which most landlords prohibit as modifications. This persists because the 2.4GHz spectrum allocation is fixed by international treaty (ITU Radio Regulations), WiFi is unlicensed so there is no coordination between neighboring networks, and apartment construction materials (concrete, steel, fire-rated drywall) reflect signals back, creating additional multipath interference.