Oh wow this brings back memories. More than a decade ago I lived in shared housing where each room has its own telephone port. The idea was every person was supposed to get their own internet. But after a few months of troubleshooting my housemates' internet issues I decided to open up my wifi to everyone else. I used Chillidog, a captive portal software that runs on ddwrt. I had a 3 hour continuous-use limit, after which weird stuff would happen to their images like being turned upsidedown or blurred. I used this very site to make it happen!

Eventually, my housemates just contributed to my internet bill and dropped their own subscriptions. I got rid of the captive portal and went with something more traditional