That doesn't sound very decentralised.
oh, and three acounts hold like 25% of all btc in circulation.
crypto can do some things, but decentralization isn't one of them. just ask Coinbase
USD tether is barely crypto at all, it's a wrapper around treasury bonds which the US govt. regulates
That's probably socially harmful, but it is the claim.
The latter is volatility.
Apples and oranges.
Resources like gold, land, or bitcoin, if broadly used, is deflationary as the economy grows, even from simple issues like population growth. All else being equal, if I save $100 today, and the economy triples, it's worth $300, since I have the same piece of a bigger pie.