Filecoin is solving a real consumer problem (needing backup storage but having empty local capacity,) using blockchain protocols!
https://filecoin.io/blog/filecoin-proof-system/
Blockchain problems can sometimes be replaced with simpler tech, but this seems like a great match.
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I find it really interesting how some areas of tech are widely expected to improve radically (e.g. LLMs and smart home tech), others gradually (CPU speed, battery capacity) and others very slowly (e.g. compiler optimisations).
Predicting the future is hard.
Designing UIs is such a hard problem.
Sometimes I try a bunch of options and I settle on "this one seems the least annoying".
It's incredibly hard to explain adversarial problems to users. I see gamers sincerely asking "why doesn't the publisher just fix the cheater problem?".
This is exacerbated by the fact that sharing too many details of anticheat can make the problem worse.