Lawyers don't decline to give legal advice for free just because they want paying, although they do, and fair enough. Law is a highly complex and recondite field, and a solid answer on any but the most trivial question requires nontrivial research to identify with confidence.

Lawyers also have a professional guild to which to answer, and if they say something offhand which turns out to be erroneous in a way that brings someone to grief, their guild will not be pleased with them.

In fairness, I probably wouldn't take the time here either; on the one hand, I block ads anyway and so don't have such problems, and on the other, I tend only to do that when it's to my own direct benefit that the issue be fixed, and broken ads on a site I'll visit once ever don't meet that test - when Postmates screws up their UI and I have to stub out some analytics functions to place an order, they get an email; here, I'd just add the site to my JS blacklist, reload, read, and go on about my day.