Crypto hackers are everywhere.
Especially crypto malware, and i dont mean ransomware that can encrypt your computer, but simple malware that can be spread as any file type.
The most basic crypto malware works like this, your computer gets infected and and when you make "coin transaction" it automatically detects the address you want to "send" those coins, then it replaces the sending address with a new address so quickly that you wont notice it.. even the transaction address will look similar to the one you wanted to send.. Usually the beginning and ending will look the same. Antiviruses wont detect these, because usually the people who sell such malware offer re-coding service for once in a week for example, so this way it will hide from the AV updates. People even offer such malware for free, they create the virus, you will spread and the crypto pool will be given like 70-30%.
There was an case in darknet, where crypto "hackers" created phising darknet marketplace sites and people who visited those sites wanted to credit their accs for buying drugs or anythings else illegal.. so they got scammed out of coins, and the "phisers" thought that this was it.. nobody can touch them because those people who they scammed cannot turn to law enforcement, because they were criminals themselves.. so they even didnt put any effort in, to tumble or mix the coins they stole.. but they were wrong, those who got scammed went to police and the "phiser" got caught and sentenced afterwards. There is a full article of that guy and the story on deepdotweb.
The point is, if you deal with crypto.. you need to be very cautious about everything.. i remember year ago going into agency because i needed cash for coins and these people wouldnt allow me to use any connection in that house.. i needed to make an hotspot with my phone for the transaction, crypto is easy prey.. especially nowadays when everyone jumps into it, without having any knowledge about basic computer use or security.