Man, I had to dig through the thread all over again to find this but I knew it was here somewhere. They make money from advertising by schools and Google but exactly how is well hidden. I used "view source" and "inspect" but I couldn't find any explicit affiliate, CPA or ad links. I could see references to doubleclick.net, which is Google's ad platform but I couldn't figure out how their forms interacted with their advertisers. The ToS page says some schools are paying advertisers and others are listed for free. The company that runs the site is Project 8 Labs LLC who specialize in Education and Career: "The people of Project 8 Labs work collaboratively to develop and maintain a portfolio of free career and education websites". My guess is their advertising and sponsorship deals are run through the main company and all the various websites they run feed back to their in-house marketing and advertising contracts. I googled for other sites and found some educational affiliate programs. Most are for online course sites like Udemy. But elearners.com has an affiliate program sharing revenue from the online accredited programs they work with. You need to submit an inquiry to get details. There is an affiliate program link in the footer.