Yes Bitcoin and cryptocurrency are illegal in the world law, because the government can not control it. But in most countries it is legitimate now. I am sure when people of the world fully understand the true meaning of Bitcoin, then it will get legal validity all over the world.
Yes you're right cryptocurrency are illegal in the world law cause it cannot control it. And some countries they can't accepted bitcoin but if they know the true meaning of bitcoin and understand truly the uses of bitcoin in there people I think bitcoin make legally accepted all over the world.