There some lack of understanding by some people here.
Yes, there are and have been cryptocurrency pyramid schemes - bitconnect being the most famous currently. That does not mean all cryptocurrencies are pyramid schemes. Bitcoin is literally the opposite of a pyramid scheme, there can only ever be 21 million coins, not 23/22/24 - 21 million, that's it.
The usd on the other hand.... That is a pyramid scheme, it has no supply cap and can be (and is) printed at will. What is this FIAT currency tied to?? Nothing... Nada, thin air since the 1970s. The fact is, you are dealing with cryptocurrency already, as these fiat currencies are digitised assets, the money in your bank doesn't actually exist. In the UK, if everyone tried to withdraw 3 percent of their money to cash, the system would collapse. The banks create more fake money to lend based on the money they already hold of yours - they lend money which doesn't exist (fractional reserve). How about you turn the graph around and bitcoin isn't booming, but the usd is tanking?
These fiat currencies are pyramid schemes and are all destined to fail at some point. In 2020 to us printed 20 percent of all dollars ever created, and that's not a problem to you? Not a red flag?? If that was a traditional cryptocurrency which did that, you would label it as a scam.
Suggest you look up fractional reserve and quantative easing before labelling all crypto currencies a scam and pyramid shceme.
Additionally, smart contract platforms can be used for so much more than just a currency. They can be used to track supply chains, provide immutable audit chains, allow cross platform sharing of records (again immutable) the list can go on.