Great question. I work in a county where there's an extremely well-known credit union with an education focus-- if you're a university student or employee of a school, you and your family can join the credit union. I joined as a student because it offered no fees for pretty much anything. As I grew into a career-person, I learned about the massive benefits. First, they're a not-for-profit. Their goal isn't to get rich and make people rich. It's to keep the money safe, keep member credit availability high, and then share what profits are had with their membership.
Here's a great example: Most savings accounts accrue infinitesimal interest (if any). At this credit union, you get a .05% APR. Nothing special. You can open a Money Market account and get .1% APR, though. What's the difference? To the end user, nothing, really. You put money in and you take money out. Here's the good stuff though-- There's a Summer Saver's account (remember the education focus?) where you can have up to $2,000 of each of your paychecks deposited. This earns 3.0% APR! You can withdraw some/all the money whenever you want, but you can only deposit via your paycheck's direct deposit. Thus, your money isn't tied up, but while it's there, it's bringing in better interest than any other no-risk savings I've ever seen.
Additionally, they have variable limit credit cards, rewards credit cards, home loans (PMI/Non-PMI, etc.)-- and all at rock-bottom interest rates because their goal isn't to milk money from you, it's to make sure you pay back your debt so that the members (including you), keep bringing in good interest returns.