I mostly agree with him, but very hard to say it's wrong to speculate on crypto/bitcoin. I personally know at least two people who do not have to work because of the amount of money they made from bitcoin (they were very early adopters). Yes, it is largely building castles in the sky, but some people will get genuinely wealthy from it.

In my opinion you should approach it like you would any other form of speculation: risk what you're comfortable losing and have a plan for when you'll take your winnings.