are the reviewers in the expert market real buyers or any one can enter and write a review?

[Mustafa Amer Mohamed Amer]

are the reviewers in the expert market real buyers or any one can enter and write a review?

that's my question thanks

[Marco vd Heijden]

People who purchased the product.

[Keith Watford]

I see that to make a comment it stipulates 

"Only users who purchased or rented the product can leave comments"

There is no such stipulation in the review tab.