The guy has proven tech skills. Order him to pay it back. Let him work and garnish his pay. Put him on probation until every victim is made whole.

Unless you really think he's rotten to the core don't let those 4 kids grow up without a father. Hating the world, hating the government, and hating their dad. You create 4 more victims, an additional burden on taxpayers, and how will he ever repay anyone from prison?

If he fails to keep a job, fails to make payment progress, goes out defrauding people again, or fails to care for his family - then you can wack him with a parole violation and then prison becomes an option.

My $0.02.