This is probably the only time I actually feel sympathy for someone getting scammed like this, because cancer sucks and it affects everyone in some way eventually (my family has had to face it too). If they ever catch the guy that did this, his property needs to be searched for corpses because this is some hardcore psychopath behavior.
But the lesson of this is the same: don't ever use crypto currencies. Don't accept them, don't buy with them, don't mine them, don't even look at them. Even if you don't get scammed, your engagement with the ecosystem supports people who do shit like this.
Not sure if you're being sarcastic or not, but the point of this is to reduce overhead associated with virtualization (aka VMs). Few workloads are able to take advantage of the massive compute resources that a single beefy machine has, so partitioning it is the most efficient use of resources, especially in data centers where maximizing efficiency is important.