Even in the US I think you can't advertise a service that you are not legally allowed to provide. Does the first warrant make you immune to fraud allegations?

Even in the US I think you can't advertise a service that you are not legally allowed to provide. Does the first warrant make you immune to fraud allegations? I'm not an expert and am ready to accept that I may be wrong. If you know any sources on the matter, it would be interesting to read.