Summary Do not tell people who has not invested on Bitcoin only the positive side of Bitcoin investment, also give them or tell them the more of the negative of Bitcoin, let them know that price of Bitcoin is not constant it always fluctuating, so that they will not having such mind of becoming rich they have invested in Bitcoin with a short time.
You have said it all, i don't know why some persons will introduce someone to an investment you know that you are not getting any rewards for introducing them but still can't tell them all the truth on what they should know, what are they even hiding. Someone can tell or teach people about bitcoin without even trying to persuade them to start investing. After telling people about bitcoin it should be their choice to invest and not to be lured to invest against their will.
Due to the volatility of bitcoin, it will be erroneous to only tell people about the good side of bitcoin and not tell them the ugly side and the need for them to hold for a longer time interval. Inasmuch as most of us are hodling with the belief that our investment will make us become rich someday, but we should not be overzealous or expect so much from our investment, things can still go the other way round.