Praetorian Training Academy
The US Constitution doesn’t allow people to be tied to contracts, no matter how cleverly worded or how earnest both sides are. This goes double for minors! What can happen, however, is that penalties for breaking a contract can be built into it or decided by the legal system.
All students at PTA agree to pay back three times the amount of the damages that were covered by the Praetorian Group, plus interest. The interest is covered as long as the student is on-call and covered by clients who pay a hefty retainer for the ability to call on a superteam as needed.
In return, the students get training, education, room, board, access to some kick-ass entertainment facilities and a modest (but more than adequate) stipend. The ‘pay’ for the jobs they do goes directly against their debt to the PG.