It's not holding but using, but remittances (or in general, money transfers between places where at least one end isn't well connected to the international bank

It's not holding but using, but remittances (or in general, money transfers between places where at least one end isn't well connected to the international banking system) are one use case. Instead of finding a company active on both ends (which will have to be a major company like Western Union, with major fees), you can find two separate (potentially local and small, think "coner store money exchanger") entities to get fiat (regular) currency into Bitcoin on one end and out of Bitcoin on the other end. If there is no single company that does business at both your source and destination location/community, there's a good chance you're out of luck. You have to trust those two exchangers to not defraud you, but these two don't need to trust, or even know, each other. Of course, other cryptocurrencies, stablecoins etc. would also work for this, but network effect means Bitcoin is the coin where you're most likely to find participants on both ends.