In case you get lucky for investing early, you should not hold any longer. Let them if they will considered all cryptos as a scam just because they have been scammed. We don't need that kind of mentality in here anyway.
That is really understandable as it was a feeling of being scammed on their first try but they shouldn't be supposed to generalize crypto as a scam thing coz that was wrong and it was proven by many already.
Anyway, they are just a few while the majority who knows crypto will eventually come back and enjoy their life even they have a bad experience. And this is a so-called market essence where not all the time we got lucky, sometimes we got mistaken but still, our trust remains.