You are right, but the presence of a diploma from an employee does not confirm the fact that he is an expert in his field. Anyone can buy a diploma.
You can get a real diploma, but you can buy marks for this diploma. Then you will have real documents, but without the necessary amount of knowledge in your head.
Well, the project does not exactly solve this problem. This is a problem of this or that university, since you can buy estimates from them
We all know that demand creates supply. Students would not want to buy grades, no one would sell them. Everything is interconnected.