I was looking through some backlinks for a random website and one of the backlinks was from a Cali elementary schools website. The website was real and had recent, school related content on the front page. The page with the backlinks had over 6k of them, and it could only be accessed with a URL. I also saw a .edu website that did that, and from what i heard .edu links are very good for SEO.. Ive seen a few other similar cases and i was just wondering how this happens. In the schools case, is someone who has access to the website secretly selling backlinks? Where do people even look to get in on these backlinks?