Ransomware is going to be much more expensive to do.
Right now there is little cost to doing bad things on the internet.
But the point is a little different.
Crypto solves among others the problem of technology moving faster than legislation in ways that can't be tampered with.
That's the big innovation of bitcoin. Someone created a store of value system and threw away the keys to the engine room which means it can't be tampered with by rough actors.
Let's test that with ransomware - how does it solve that societal problem?