This sounds like a good idea. I do wonder if enough people would sign up for it to be a worthy venture because I think the main issue with ads is I think once you add any price at all dramatically reduces participation even if it’s not about cost some people just see the payment and immediately disengage.!
In some cities including Boston itself, it’s not the Fd that resets it but the fire alarm company of record(I work for one) who also gets a call. The possible issue is if another alarm comes in before the tech arrives it will not report to the FD again.