He once was introduced to a scam altcoin and to his limited knowledge the one who convinced him to invest in the altcoin is influential to him. Though he may have learned his lesson after the loss, he may not be interested anymore until something will force him to. But today his friendship with that influential guy must have turned sour.
You can only advise so far but its still his decision.
that's where the danger is a lack of knowledge, thus creating a split friendship. therefore we who give advice and other people who are given advice must be smart. in the sense that you have to study thoroughly first, don't just believe in what your friends say, of course, what you imagine at first is happiness without any knowledge about risks, so that it ends badly