I think TCP/IP-over-DNS has been done for getting free internet over paid Boingo hotspots in airports. Eventually free Wi-Fi became the standard and this is no

I think TCP/IP-over-DNS has been done for getting free internet over paid Boingo hotspots in airports. Eventually free Wi-Fi became the standard and this is not a thing anymore. We have just progressed to fighting the in-flight free Wi-Fi battle now. Eventually in-flight Wi-Fi will be free everywhere. It already is on several airlines.