What they mean by intrinsic value is that something has demand outside of speculation. For example, precious metals and real estate have demand even outside the financial world. Stocks, bonds provide income in form of dividends and interest rates, and are legal form of ownership or lending.
While cryptos don't generate income like companies, don't have industrial use, nor give you legal rights, it's just mostly speculation right now. You're gamlbing on a fact somebody's gonna be willing to buy it later, but 99% of price and transactions are purely speculative without any real world use.
But usability doesn't provide value on its own, nothing does. Value is always relative to how much one wants to pay and the other to receive. Be it crypto, gold or potatoes.
For an instance, gold has very little industrial application, less by day on jewelry and yet its value goes up, because usability is unrelated to value.
The belief on "intrinsic value" was part of the problem at 2008 crisis. Real estate, like anything else, depends on supply and demand rules for its value and it eventually came down.