Witch such small investment, even if bitcoin will go x5 to new ATH ... its still like 250$ profit in like 2-3 years. Wouldn't it be better to spend those 50$ on books/courses to get new skills that will allow you to earn more and come back with that extra money? I mean like, if you have only 50$ ... i don't know if bitcoins is the best place to put them. The timing is good, bitcoin is cheap right now, but you won't make much.
Do you have any better suggestions for him? A get rich quick tool. It may be a very small amount to many people, but sometimes it means a lot to many people.
I know what you said didn't mean to offend him, but you will probably disappoint him because he is DCAing every time he has money, he never said he would stop with a $50 investment in bitcoin. For someone who doesn't have a lot of money, but if they work hard to accumulate it for a few years and when bitcoin increases in price, it becomes a decent amount.