To me, bitcoin is not hackable; however, the bitcoin network might be hackable. So the question should be "how strong is bitcoin network?"
And Bitcoin network is vulnerable like any other network so there is no such thing as 100% security. We all have to be aware of this.
Very agree with you, nowadays hack has been so much depends on how strong the network security to be able to protect bitcoin
Well, if in number, just like what the creator of directory.io says. I personally have made one, the question is, If there was fast way to crack all, then we had to start over.
There is at least one thing we can do, If we send share to others such as exchange, we should presume the sent is never be back.