Probably b/c of his perceived wealth (at that time at least). If it weren't for that, he probably wouldn't get a job as a starbucks manager.
Governments will try to rollout CBDCs, and banks will get into the exchange/custody business, and 99% of cryptos will disappear, but no, it won't be fully integrated into the current banking system as we know it today...IMO.
Those who choose to invest in the right cryptos today are lucky to be involved at this point in time, and will generate wealth, if not generational wealth in the not so long term.
Unfortunately, I missed the mark back around 2010 when my buddy (a super smart engineer) was trying to sell me on bitcoin (it was sub $1 then). I told him he was a moron. He gave a bitcoin to our other friend to play around with it. I didn't even want to learn about it and declined. He continued to accumulate and never sold as he believes in the future of crypto (i.e. not just trying to sell to make money). Had I put even just $100 in back then, wow...well....I've been regretting that for years.
We're still early, but not that early, and the opportunity for massive returns continues to decline as more people get comfortable with it. I for one will continue to DCA.