IGMP with ISP radius accounting

Have any ISPs (which really means vendors) looked at integrating IGMP
support in edge switches with RADIUS? I'm aware of IGAP, but that
involves changing the packets and identifying individual users. I was
wondering about using IGMP snooping to trigger RADIUS accounting events,
e.g. join, leave.

Although I received several messages from ISPs interested in what I
found, I didn't find anyone with a product capable of IGMP snooping and
Radius accounting yet.