Lets say a real person, who is doing very well in a job that contributes to society, can take home 150k a year. And lets say they work from 18 to 65, that's about a $7M career over 50-ish years.
The crook in OPs post stole more than 440 lifetimes of wealth. Even if he were to be put to work paying off that debt in the highest paying position which productively aids society (no lawyering, no managing, no marketing, no internet fame bs) it wold take him over 440 LIFETIMES to pay it off.
You can sentence him to 18,000 years of prison but he will never receive even 0.5% of that punishment.