The user pays a fixed monthly fee to @Coil who acts as a middleman between the user and the various web sites they visit. Web sites can accept it as a universal subscription to premium materials, ad free service, or just donation support. You go to a helpful site and instead of seeing "please donate to help us keep our site ad free" you see "thank you for being a supporter". In the future, you could be properly supporting every web site you visit instead of seeing ads are annoying and insecure.