The first thing you may want to do before getting in the debt collection business, debt collection 101 let's call it, is learn the correct spelling of the word debt.

Debt collection is something that is highly regulated by law, at least in the US.  So is credit reporting.

I could see an existing debt collection business getting into collecting bitcoin debt if they really wanted a challenge, but I don't see someone just reinventing the wheel from scratch.  Half the problem is people don't know or can't prove the real world identity of the people they're doing business with.

Ironically, companies like PayPal, Visa, and MasterCard have solved this problem for a small fee of around 2.99%.  Get burned, initiate a chargeback, problem solved.

The solution is realizing that Bitcoin is the wrong tool for certain jobs, and to not use it where that's the case.