Are cryptocurrencies worthless?

Non-coiners like Warren Buffett says things like cryptocurrencies have no real value, that they are instruments for speculation and are a comical display of the greater fool theory.

And sure, when we compare the crypto market to the stock market, it seems kinda true, after all, companies like Walmart, Microsoft, or Tesla provide real utility and their stocks must have real monetary value.

But, what do we make of banks, brokerage firms and financial institutions in general? These are companies that store your money for you, give you an interest on your savings account, and allow you to trade stocks (speculative assets).

Aren't cryptocurrencies, and I'm taking more here about smart contract platforms like Ethereum, Solana, Polkadot and the likes, essentially like bank and brokerage firm stocks? They provide similar services (lending, borrowing, trading), only in a decentralized, public way, and in different currencies than what the legacy financial institutions offer.

Am I missing something here? Sure, the crypto verse is full of scammers, grifters, and vaporware, but the basic idea stands. Smart contract platforms offer similar products to financial institutions, and therefore should have value.