Those numbers aren't a joke, OP. I guess the mindset of "risking something that is worth losing" is already in your uncle.
I just imagine how would it feel to at least have connection inside the crypto space though. I was referred to invest also in Bitcoin back in the days, but I lost contact with that friend of mine due to them moving out.

Just a tip there, OP. Let them explore the coins that "they feel" worth the coins, because they still need to get used to the volatile conditions of the market. It isn't the same as stock market trading from your uncle's experience.