How does FreeCodeCamp decide certificate validity?

Hello everyone, So I just completed 2/5 from the Responsive Web Design Certificate, and I wanted to know, does FCC check the projects I built? How does it know that it met the requirements? I just insert the CodePen links and click “Submit” and FCC goes to next project. I even tried to remove a requirement and submit and FCC didn’t show any errors.

TLDR: I want an elaboration of how does FCC know that you actually completed the project and did it correctly.

So there is no algorithm-based validation of any sort? What is the Project Test Suite for then? Don’t you think this affects the certificate’s liability?

You can read a bit about this problem on this Github issue.