You are forgetting that cryptocurrency has real uses. You can send money to people without using a bank or PayPal. I use it to pay for things online anonymously and being able to do that is very valuable to me and to other people. You can use crypto to buy a gift card for any store if they don't accept crypto directly.
I have nothing to gain by saying this, since I don't keep any significant amount of money in crypto. I don't care what the price of Bitcoin or another coin is. It's irrelevant and doesn't affect my ability to use this technology.
Cryptocurrency is not a scam. It's just a distributed ledger.