we enforce laws presumably in the name of safety, is this really nefarious framing or marketing? seems pretty straightforward to me.

It is very clearly advertising on their part. They have been paid to put that thing there and added the sign to announce the presence. It's like when you get your roof replaced by a business and they ask if they can put a sign in your yard. They're not doing it to make everybody know that you're getting your roof replaced, they're advertising.