NFTs - yes you can right click and save as. No they haven't figured out at scale how to attach the image / work to the ledger. Yes hype and pyramiding is a fucking disaster and people would go to prison trying those antics in any other industry. But digital art, music, & culture has a real deficit in ownership, provenance, etc.
Cryptocurrency - Yes there is pyramiding and wash trading galore. Maybe tether has inflated the entire market by a million percent. Yes proof of work uses too much energy. But gov't money printing, censorship, property rights, transfer complexity etc has left a vaccum for something that even resembles a currency that serves the individual.
As others have noted many times over we are very early, it is unlikely that we've yet seen what will be a broadly used solution but there is real product market fit here already illustrating massive demand.
On HN in particular how do you build something to serve to that end?