More developed countries have a higher median age, which would be less conducive to technological and economic/monetary changes and shifts.
The evangelism comes in a multitude of forms, but most of what the most developed and wealthiest (by GDP and Income) countries encounter is simply "to the moon" sort of stuff rather than boots on the ground sales and adoption. It's about selling immediate benefits, practical benefits and we know they are a massive upgrade over the fiat system.
We don't need a situation like Venezuela, Lebanon or Argentina to bring about mass adoption. It's about building solutions and then actually doing the marketing and sales work. Inflation and fees have battered businesses and consumers, crypto is a way out. Digital content providers are hammered by chargeback trolls, crypto as a transparent option sans chargebacks gives them protection. Savings accounts still can't keep up from a APR perspective, there are options within crypto. Allowing people and businesses to diversify their currency holdings is a good thing, after all, investors are encouraged to have diversified portfolios (well, they were until index funds).
The colossal meltdown is inevitable, but it's a lot like preparing for "The Big One" earthquake in California along the San Andreas Fault. It hasn't happened yet and it still may not happen for a while, but why wait for the meltdown when the benefits can be had right now from preparation?
U.S. styled financial hegemony has been copied. FATCA spawned CRS elsewhere. CFTC crackdowns on FX firms were copied by ESMA. The SEC's actions and rhetoric toward Binance are being copied in Nigeria.