What's the Responsibility of a Crypto Marketing Firm?

A lot of crypto operations are for going in the in-house marketing team and basically having an agency be their marketing their marketing part. There are many agencies good and bad that function as an outsourced marketing team because if you're young it's attractive to get all of that in one package from a shop. The question is interesting because if I were running an agency I would conduct extreme due diligence and probably have my lawyers and maybe even finance friends take a look at what was going on.