What you describe here is grouping of thousands of different types of demographics into one. The reality is very different depending where you live, and your level of technology access varies. A fleeing Ukrainian is very well versed in Bitcoin - Ukraine has one of the highest levels of adoption. A Nigerian is also very versed in Bitcoin - despite their government's attempt at curtailing use, they still find a way. A kid in Congo may or may not have access to a smart phone - that I have no way of knowing, but I do know that cell phone access is ubiquitous in Africa despite what many imagine or believe. Sure, their needs may be better served by a stable coin, but that does not relieve bitcoin of value. A Salvadorian may or may not understand Bitcoin - but this is like asking the population to understand how your email protocol works - there's a lot to learn. Even in a country like Japan, Bitcoin is becoming a safe haven with the Yen losing 20% of its value when comparing to USD.

Going back to the topic of the "most vulnerable", a bank that you and I take for granted is a luxury in many of Africa's nations. Bitcoin is a permission-less banking system. Does it have technological hurdles for the average person to overcome? Yes. But this is all being worked on right now by people I talk to every day. The same way that most people have no idea how SMTP works, you won't really need to understand behind the scenes of Bitcoin. There are various levels of autonomy and people will fall on the spectrum of where they are comfortable, with the level of privacy / security that most fits their Bitcoin education.

You might find this short video interesting (only 10 seconds or so): https://twitter.com/HODLneverSODL/status/1518134911244320769...