They should at least be charged to more than 150% of the actual damage they took so that the victims who lost their money in such hack can recover their loss as well as the authorized entity who is been taking legal action against such scammers too makes some benefits by penalizing the scammers.
It's pointless to charge ridiculous sums of money from the hackers when you don't know if they'll ever be able to cough it up. It's just as pointless as sentencing someone to hundreds of years of imprisonment.
This would also create fear in minds of other people whoever though to do something huge to scam anyone. This would bring more security to the people who are linked with the bitcoins or cryptocurrencies.
In certain countries there is the death penalty. If the death penalty isn't enough to prevent people from committing crimes, what would a silly fine do that people will never be able to pay off? If you're already fined like millions, the next couple of millions in extra fines won't change anything at all so you can basically continue stealing from innocent people.
People just need to be even more careful about how they store/secure their cryptos. It's once again a sign that mass adoption is far away.