The main reason of this increse is possibly explained as below,
1. Venezuelan dollar is facing hyper inflation that its purchasing power has decreased to the lowest level possible.
2. Due to the recent lockdown, their left over production industries halted production activities which further weakens the economy and its currency.
3. Venezuelan citizens are possibly looking for a highly liquid asset to safe guard their money
It is a joint impact of Coronavirus and weakened economy of Venezuela.
It is hard to fall more when you are already at the bottom...
Venezuela's economy is one of the worst in several aspects.
Halted production? What production? Most production stopped in the past years of price fixation policies, and nationalization of industries left to rust abandoned. The goods that returned in today's Venezuela, are imported and overpriced (before the virus), yes including Toilet Paper
Venezuela's fiat coin is formerly called bolivar, like the historical figure (notice small cap to distinguish from the actual family name). This coin has been "remade" (to slash zeroes) 2 times, once in 2008 to slash three zeroes, and another in 2018 to slash 5 zeroes, so the current "bolivar" has a suffix to denote its current (3rd) version: Soberano (VES), previous version was Fuerte (VEF) and the original without suffix (VEB).
Current wages in Venezuela are too little (about $5 for a monthly wage, $10 if you land a "very good" job) to save anyway, and if you kept bolivars you would not be able to buy tomorrow what you can buy today. So those that survive, are either earning in foreign currency (or crypto) or get foreign currency (or crypto) sent from abroad by family or acquaintances.
This is why i mentioned "whales" in my previous post.
In my opinion, it really isn't happening, not by people living normally here anyway, at least not common people, but a few rich whales.