[supertrope]

It's not a technical or even standards setting problem. IIRC there's already a RFC for DHCP announced login webpage. It's business and legal - layer 8 and 9 problems.

Operating system maintainers have added captive portal detection to improve user experience. Hotspot owners often sabotage captive portal detection by whitelisting Apple and Google's CPD URLs! AAPL & GOOG have to change these URLs periodically and 802.11 vendors add the new ones in a cat and mouse game. So the customer's phone and thus customer think they're connected but they end up hitting a CP. Why? Because the CPD browser will close immediately upon receiving unencumbered Internet access. While many just want the legal liability limiting I Agree button to be tapped, many others owners want customers to see their store promotion/ad flyer page for longer than a second, place a tracking cookie, and do other value adds.

The interests of Wi-Fi network operators and users are not aligned. Right now only equipment manufacturers directly profit off Wi-Fi service. Hotspot owners can only indirectly earn money through attracting more hotel guests, cafe customers, etc. Some now harvest customer MAC address and in-store walking behavior. Ideally hotspot owners could receive a revenue share for offloading traffic from LTE, which would give them an incentive to be more loyal to users and maintain quality of experience.

https://news.ycombinator.com/item?id=13369038