There was something about the trick who I hooked up with and he used a medical clinic that (possibly the STD clinic) and they asked him if he had used any hook up apps. He must have responded yes and given them his contacts and then via BBRT I got the notice. this was easily 15 years ago or so, I’m not certain if this still happens. The email I received was linked to something like this letter, but local, not Rhode Island, obv.
But the email was definitely via BBRT, and the letter/website was the County Health department. They did not tell me who the contact person was, however.