I told you already that the people in the developing world for the most part don't have money to invest in coins.
Actually, that's incorrect. People in the developing world have much higher savings rates than people in developed world countries. It doesn't mean most of them wouldn't go for tangible stores of value, but some could and do invest in cryptos too.
Yes, full fledged digital fiat and decentralised cryptocurrencies are a separate animal. One question might be why the average person would want to use something like bitcoin when the government is offering them what they know already in a safer and more convenient form.
Because supply of crypto currencies is predictable and cannot be inflated at a whim and thus can be a store of value?