Give freedom to all users.

Sure, everyone already has that because they can review whatever they want. No one is restricted to one type of review.

I am sure this platform will grow fast.

I am very sure and hopeful of that too.

This is not just a difficult problem but the ability of people who are not the same.

What exactly are you or anyone finding difficult to do? I mean, how is "reviewing" something difficult? As long as you are reviewing something you know and understand, I believe that you should not find it difficult to review.