But how could hackers steal that much bitcoin back then but not today like mt gox 2014? Arent hackers employing better hacking techniques today than in 2014? What about the lubian hack? Why couldnt the mt gox hackers launder all 850k bitcoins?
That time, there was no adoption of cold storage unlike now, I'm not sure if there was anything like hardware wallet then, most exchanges at that time used hot wallets, and that was how the exchange was compromised. Today, we have a huge adoption of cold storage where centralized exchange keep large funds and keep the rest on their hot wallet, even with this, there are some exchanges that have been hacked in recent years. Last year, Bybit was hacked, and Bitcoin and Ethereum worth billions were stolen, which was bigger than the value stolen from Mt gox, but today, the amount worth stolen MT gox is almost the size of the Strategy, which can kill the price of Bitcoin if such an amount is stolen today.
The stolen Bitcoin of Bybit that happened last year here most were laundered through some dexes like Thorchain, all these were not around when Mt gox was hacked that time but that does not mean the hacker is safe, some of the laundered coins are still traceable, some of the converted Bitcoins are in other coins like ethereum, if they decide to spend any of those coins to fiat, they will be caught, these money are too large to spend, they are moving on different chains that has liquidity, ethereum takes large share but they can't convert to fiat.
Crime doesn't pay, assuming they return that amount, they would have been compensated with something good instead of running around with stolen money you can't spend.