ANYTHING can be used as money. The systems that we currently have in place have lots of big problems, but "we" decided to use them and that's why they are popular. We could also decide to use a cryptocurrency as money, and it would be equally valid, and it would become our "money" - that bit is fine and I'm not arguing with it.
What I am commenting on, and what I am calling bullshit, is the cold hard reality of crypto - there hasn't been a coin invented yet that is anything but a ponzi scheme. Everything from bitcoin to ETH to dogecoin is just a scam to make some people rich, even if it started with good intentions(and I believe Bitcoin really was started with the intention to become a currency).
The second this changes, and we have a cryptocurrency that is actually used as money and not a plaything, I'll happily stop complaining about it.