Plenty. Everything is kinda known, but I talked with him specifically from the standpoint of threat modeling so it turned out to be quite a systemic overview. Hard to tell in one sentence. Practically for Bitcoin traders in the so-called Western world official license is useless, it turns into self-reporting and eventual additional problems, exchanges aren't partners but almost adversarial actors, buyers as well may be scammers or scammer-driven muppets (like very old person with dementia who buys btc for nigerian persona) quite frequently.