Consequences of running a STR when not allowed by city?

[Kylie Tollios]

I, like many others in Denver metro, would love to operate a STR (preferably non-owner occupied). Most cities don't allow STR (yet) or mandate they are owner-occupied, but looking on Airbnb, there are plenty of people doing it (I would assume illegally). I can't find anything that states the consequences if you get caught (or how they would find you). Anyone have any insight? Thanks!