People like to be using low network transactions fees which took so long time to be confirmed, but people like those low fees because they need  cheap things. But the fact low transactions fees are actually cheap but they are risk when they took so long time to be confirmed, there is how the hackers are tar getting blockchain unconfirmed transactions

Such transaction like this been been confirmed within a minutes because as you can see the transaction has been using high network fee, so that's it were difficult for hackers to to crack that transaction

But if you'll be using low transaction fees the transaction will took too long to be confirmed, so that's the hackers must work on the transaction which took long time to confirm.

Just look such transaction like this which has been using low transaction fee, look the time when the transaction was made, but till this time is 11:50 pm, so its just like three hours the transaction doesn't confirmed yet, so that's such transaction like this has the possibility to get hacked.