Are cryptocurrencies really safe?

Well yes and no. In my opinion they might still have a future only with a lot of variations. What could the future be.

As I see everyone in world at the moment can make their on currency. Every day there is at least one cryptocurrency made. 

So lets imagine every person in world has their own cryptocurrency. How do we know which one is the main one... See they kind of don't have value at that moment. But I might be mistaken. At any moment governments might just make a law of limiting the cryptocurrencies. Oh no they can't that would not work for them, cause how could you track any cryptocurrency? And even if there would be huge regulations on internet, everyone would use TOR network.

 But see here is another problem. If everyone would use TOR then government would make some kind of law on it. And someone would probably made an internet of his own.

See the future is about our actions today and in past, cause there is no future if there is no past.