To add to this to this point:
1. USD is the de facto world currency, and many (most?) banks in the world let you open an account in the local currency, plus another account denominated in USD which is absolutely necessary for doing any sort of international business
2. Venezuela's currency collapse is a problem mainly because it needs to import goods (medicine, machine tools, etc.) from the international market, which must be paid in USD, and which Venezuela now can barely source because their oil industry (main source of foreign earnings) is falling apart [1]
3. In most cases, USD is superior (more liquid, more easy to transact in, a more stable store of value) to any cryptocurrency. View 'I'm Venezuela ergo crypto' claims with skepticism, especially when they could be paid in USD to a foreign account instead. Not sure what the exact situation on the ground is in Venezuela, maybe it's very hard to receive USD because the government will seize it, but that's the a situation a foreign bank account can solve.
OTOH, if the goal is to use BTC to pay for living expenses by converting to bolivars, it's probably even easier to use USD.
[1] https://venezuelanalysis.com/news/13803