That's it.
So how it works is that people have tons of VEF from different sources, go to localbitcoins and get some btc and sell as soon as possible for usd in other places.
The thing got so crazy that USD:VEF black market rate was stable at 1USD:200,000 VEF for like 2 weeks but the "bitcoin dollar" was trading at 1USD:350,000VEF
Besides that, bitcoin has absolutely no use.
And for the people saying that "mining" bitcoin is good in venezuela, they are totally wrong, mining bitcoin is a business you wouldn't want to go in, there is alot of mafia (because of what i said above) and alot of weird things happening, only those who are related to mafia/gov/drugs/illegal gold mining/corruption in general are the ones who can mine without the risks, if you are the average techie guy you are in huge risk, from like getting all your hardware stolen [1][2][3] to even be jailed and charged as terrorist [4]
[1] https://losbenjamins.com/2018/01/vea-regimen-roba-maquinas-b...
[2] https://www.criptonoticias.com/sucesos/desmantelan-centro-mi...
[3] https://www.el-carabobeno.com/pareja-detenida-por-comercio-i...
[4] http://www.el-nacional.com/noticias/sucesos/incautaron-compu...