Crypto adoption is indeed high, much more than the western world but people are not in it to protect themselves from a volatile exchange rates but because they are desperate for a side hustle to make the ends meet. Those who are interested in preserving value simply buy USD, EUR or gold.
The "unbanked" concept is also complete BS, in those 3.rd world countries the banking systems and the fintech infrastructure is much more advanced than the ones in the west. There are indeed millions of "unbanked" people but they are unbanked due to political reasons and as a result they use alternatives payment processors which are not banks(or just use cash). When Europe was introduced to easy to use mobile banking with things like Monzo or Revolut and USA was adopting contactless payments or Chip&Pin these were already the norm. Before the iPhone&Android proliferation, people were able to do much of this stuff through the ATMs and payments systems integrated with the SIM cards. People from 3rd world visiting EU or the USA are often shocked when see how primitive retail banking and payment systems are.
I guess the rhetoric of "banking the unbanked in the poor countries" comes from the idea that "if we the rich have so many troubles with payments, surely it must be much worse in the poor countries". I assure you, this is not the case, the west is the one with primitive fintech.
The value of crypto came from the ability to speculate. Everyone younger than 30 was in it and some people made good money. These days everyone is in the stock market, anyone can buy and sell stocks from their banking app and all taxes and fees are handled so its easy as buying and selling candies.