>it fails the stable store of value test

...when compared to a handful of fiat currencies, maybe. It's not fair to gatekeep with top performers, in my opinion.

There are many national currencies that lack stability. That doesn't make them "not currencies". It just makes them volatile currencies.

In fact, that's precisely why Bitcoin has become so popular in those countries—particularly Latin America; Bitcoin may not be stable, but it's a more reliable store of value (for now) than the bolivar or Argentinian peso.