Like I said, it's something I've investigated.
Best I can tell as a non-attorney acting on advice from others, the way in which they advertise their services could be easily confused as implying a financial relationship with organizations or individuals with whom they do not have a (consenting) financial relationship. Where to go from there is an open question.
The bigger question, as always with such things, is whether they cause enough annoyance to be worth lawyering them, and whether playing whack-a-mole -- since they're not the only "service" which does this -- would be a prudent way to spend time and money.
