I think the bundling and selling of student CDOs works for a company in its early stages, since the costs for recovering unpaid tuition can range from high to being declared a total loss. Some of the anecdotes make it seem like the company doesn't receive enough feedback from employers in order to strengthen parts of their curriculum that make interviewees fail at some stages during the interview process. Creating a complete curriculum takes more than bundling together Leetcode and Hackerrank problems, where the actual teaching reflects that bootcamps and a CS education aren't in direct parity with one another. [1]
Regarding the finances, student loan debt through an established institution can't be removed through filing for bankruptcy. This allows access to federal loans and underwriters that give better rates and agreements for all the business parties invloved. I've been denied refinancing my loans from multiple companies for a combination of those effects including not graduating and having too low of an income. The business seems like a good idea but too fixated on higher short-term valuations in order to attract VC capital; rather than fixing its underlying structural problems.
[0] https://news.ycombinator.com/item?id=15011033
[1] https://hackernoon.com/bootcamps-vs-college-11dd76a4d127