AFAIK there isn't a cottage industry taking on non-compliance with free licenses used for photography, eg CC-BY-SA.
OTOH I've heard there is a small part of the software industry (I don't know that it is serviced by intermediaries) that uses the GPL to gain users and putative non-compliance to covert some of them to proprietary licensees.
The common difference is between those largely want compliance with their licenses (when they can be bothered at all) and those who largely want a payday, making their efforts must self-financing.
Personally I would enjoy a cottage industry around self-financing (ie payday oriented) enforcement of free licenses. It'd either increase the apparent trend toward non-copyleft licenses (ie much less to comply with), particularly public domain, or increase the appeal of copyleft licenses, perhaps both.
OTOH I've heard there is a small part of the software industry (I don't know that it is serviced by intermediaries) that uses the GPL to gain users and putative non-compliance to covert some of them to proprietary licensees.
The common difference is between those largely want compliance with their licenses (when they can be bothered at all) and those who largely want a payday, making their efforts must self-financing.
Folks who want to see more enforcement to bring into compliance should donate to http://sfconservancy.org/linux-compliance/ (disclaimer: I'm on their board)
Personally I would enjoy a cottage industry around self-financing (ie payday oriented) enforcement of free licenses. It'd either increase the apparent trend toward non-copyleft licenses (ie much less to comply with), particularly public domain, or increase the appeal of copyleft licenses, perhaps both.