Student loans are both a trillion-dollar debt category and also one of the most popular mini-verticals out there in fintech startup investing right now. There are dozens if not hundreds of companies in the space, and they all mostly do one of two things: either they help students think through their student loan options before choosing one (acting as a financial advisor to avoid mistakes) or they help students after they finish school figure out how to optimize their repayments or acquire loan forgiveness. And so when I heard the…