OP, from what am seeing here the person that introduced the yam seller to bitcoin is someone who have little or no ideas about bitcoin but perhaps he must have referred him to those local bitcoin brokers with referring benefits, he knows when he fix his money there, he will benefit from it at every single transactions the yam seller does, weather deposits, withdrawal or transfer to another wallets. So him himself has no good background of bitcoin, he's probably one who just throw money into bitcoin investment and see some profits before urging someone to join him without a clue. Well, in the aspect of taken responsibility for inviting someone into cryptos is good to stand as a guide to them until the person too understood or learned what he or she is doing, even if you're not liable to their losses or gains but encourage to sell when is time just as you encouraged them to buy, teach them some simple steps of transactions in case the market went wrong and you're not close, what them will need to do and before telling someone about bitcoin make you yourself knows what cryptos is all about, how it works to be at safer side. Is a nice top of discussion.