The question is more so, if Party A(customer) pays Party B(service provider) a fee to locate a certain item (as an example we will says it's a digital asset with monetary value, something that can be converted into bitcoin somehow), is it illegal for Party A(customer) to pay Party B(service provider) in fiat currency to obtain this digital asset that may have monetary value in which could somehow be converted to bitcoin.
Are you trying to get around money transmission / AML / KYC regulations by selling services as a broker, rather than as a seller of cryptocurrency? I guess it
might work under some legislations but in general I wouldn't bet on outsmarting local law based on a technicality. At least not without consulting a legal professional first.