To me I don't see it has top notch hacking. Taking a background entry inside exchanges, hacking coins on exchanges using someone's gmails, also jacking people wallet with private keys. To me I feel like all these acts ain't hacking. Where am from Hackers don't really key they device there own key. But making use of private keys or using peopled's gmail to gain access to exchanges isn't really hacking I feel like its once act of carelessness or exchanges act of carelessness. Such transactions always have an insider like an admin for the exchange betraying the whole firm.  And the issue of wallets being hacked, watch ur back. It's ur best friend or a neighbor...trust me that person has access to you.  A strange person can't just hack ur wallet. Or the issue of airdrops. Airdrop requesting for passwords also use that method to hack people's mail. For people using the same password thereby making them vulnerable. This is what I know.  Cryptocurrency is still very safe.