There’s application in responding to requests for information quickly, in a mesh network, perhaps in presence of malactors.
Online databases already exist and have been handling requests for information quickly for longer than there has been an internet, and always in the presence of bad actors. What problem is there, specifically, that the blockchain would solve?
For example the medical records of injured US soldiers are stored in and delivered using a block chain solution.
No they arent, the DoD did a study that said it might be useful for that purpose if they can solve the challenges with scaling, interoperability, and integration with legacy services.
There’s application in a hypothetical currency free from the corruption of governance. For example, an orange President couldn’t print gobs of money during a pandemic, devaluing your currency, then hand that money to corporations.
No there isn’t. Unregulated currencies are still subject to corrupt governance, the only difference being that the governance isn’t nominally accountable to the electorate. Literally nothing has stopped Elon from printing scam tokens for his pump and dump schemes and keeping the extracted value for himself.
Also, “Proof of stake” would just mean that the owners of the ledger are unaccountable random rich guys instead of the shareholders of the utility company. That’s a distinction with absolutely zero difference.