It's free from an 18 year old's perspective. No different than the no-income/no-job (NINJA) loans that were taken out by home buyers during the housing boom. That it has to be paid back or defaulted on is not understood at the time of purchase.
The point I'm making is lending money so easily drives the costs higher. The definition of inflation is too much money chasing too few goods. Demand > Supply.
If you create too much money through debt to buy houses, college educations, etc it will inevitably drive the price of that good higher. Having artificially low interest rates exasperates the problem.
It's explained pretty well here.
https://www.newyorkfed.org/medialibrary/media/research/staff_reports/sr733.pdf
"We study the link between the student credit expansion of the past fifteen years and the contemporaneous rise in college tuition. To disentangle simultaneity issues, we analyze the effects of increases in federal student loan caps using detailed student-level financial data.
We find a pass-through effect on tuition of changes in subsidized loan maximums of about 60 cents on the dollar, and smaller but positive effects for unsubsidized federal loans. The subsidized loan effect is most pronounced for more expensive degrees, those offered by private institutions, and for two-year or vocational programs."