ELI5: How are for-profit Universities different than non-profit Universities that generate profit?

I see a lot of flak given to for-profit Universities for being over priced and predatory, but I don't see a massive difference between them and a non-profit school that generates a lot money. I get that non-profit Universities provide a more authentic education and college experience, but they also provide some degrees that are not necessarily relevant in the real world. And we all know at least one example of a topic at some University that is really important but extremely poorly taught.

So what makes them different? I know for-profit colleges can be "scummier", but how are they different than a regular University?

Disclaimer: I might just be a dumb person who doesn't see something obvious. I'm not trying to advocate for for-profit colleges in any way.