Blockchain technology may be incredibly useful, but that doesn’t make Bitcoin valuable.
The most credible, logical, and legal justification for Bitcoin having value is that it can act as a digital gold…which isn’t really all that revolutionary.
Nobody shilling Bitcoin can credibly argue that it is a valuable currency because they don’t use Bitcoin to buy anything - they just want to get rich quick off it, hoping that a greater fool will buy it from them for a higher price.
The one real value Bitcoin and other cryptos have proved to have thus far is to help facilitate illegal transactions with anonymity.