The reason is because it's very closely related to gambling and triggers the same obsessive thinking as gambling does - based on my observations of how I felt and thought when I did some crypto investing - I found myself constantly checking prices and devoting huge amounts of thought to it - I even wrote a crypto trading bot to analyse strategies. If you know anyone into crypto you would know they talk about it non stop.
There are HUGE numbers of people who's brains are deeply involved with crypto. They'll be back for more.
Crypto had a big crash only recently - about 12 to 18 months ago I think, when Elon Musk made some comments that crashed the market. That crash was rapidly forgotten and people piled back in. Same thing will happen here.
Logic is not the driver of people's behavior.
Crypto is essentially legal, consensual large scale ponzi scheme participation - if you understand that then you might be able to win big.