Because while Bitcoin allows users to transact without revealing personal information or identities (possibly facilitating fraud), it is not entirely anonymous. Each bitcoin transaction is documented on a digital ledger called a blockchain, where the user's cryptocurrency "wallet" is presented as a unique series of random numbers and letters. With this, a scammer could potentially be traced after this fact.
"I always remind people that bitcoin is literally a public ledger," says Pompeovano.
Also, bitcoin is very difficult to hack thanks to blockchain.
"To hack it, you have to capture the network, and to capture the network, you need your own network of computers running 24/7, and to do that. So, it will cost billions of dollars. " Valna, Market Correspondent for The Wall Street Journal