He's right that you should never invest more money than you're willing to lose.
That said, I don't really mind investing the majority of my savings into crypto. If it drops back to zero, so be it. I'm in it for the long haul, because I truly believe in the success of crypto.
Same thoughts here.
That's also what I'm counting on, that there are more like-minded people. Can't drop to zero if there are enough people that think alike.