This is also a reason why in Europe when you have a diploma from private university, nobody really takes that seriously and looks at you like you would be showing him diploma from University of McDonalds.
There are some good private ones; but most of them are degree mills.
Even 10 years ago, this used to be the case in Poland. But now, with demographic decline (current generation of students significantly smaller than previous ones), universities are desperate to fill the seats. If they don't, they lose public funding, which means layoffs - and no one wants that (the university, as any institution, first and foremost serves its employees).
One approach used is to attract foreigners (mostly students from Asia and, to lesser degree, Africa - the main draw is the EU visa), another one is to keep lowering expectations.