In Dialerwahn - the next phase Isotopp reports on an IP payment system that generates paid page requests based on logged IPs and the association of these IPs with a user. So far only in use in Austria - but highly stupid. They probably have never heard of IP spoofing, but also not of anonymous proxies and tor ...
IP-based paid services must be based on some form of authorization. Either the classic password technique or better on client certificates. Anything else is highly nonsense and doomed to fail. Anyone who bases billing to end customers on the basis of the logged IP address simply does not understand TCP/IP and the Internet.