They really didn’t. The fact that it was really useful was blindingly obvious to everyone pretty quickly. Like nobody was confused thinking it was better to
not be able to check your bank transaction history online.
The question at the time was how useful, and how quickly things were going to be transformed and what it was all worth since the hype and valuations got out of control.
And there were of course dumb ideas that got funded (like the cue cat) and good but early ideas that were overfunded and poorly executed (like webvan).
But life was changing irreversibly at a very visible pace as digital solutions took over. Remember when every business district had a travel agent?
There are no real uses of blockchain technology today that aren’t a variation on financial speculation (aka gambling) and illicit activity.
Don’t get me wrong those are great use cases. Gambling and banned transactions are a major sector. But that’s the limit of the whole affair and that’s been obviously the case for a while.