They are mostly paid, so do not pay attention to ratings. In general all rating websites are paid, so you can create whatever rating you wish, if you have enough money. Do your own research and do not trust such websites.
Do you mean it is fake rating ?
Yes to boost up their appearance. Usually those who lack in experience and new comers are just looking for trust rating platforms whenever they are about to make a decision. But definitely those platforms are just a business and no way an independent one. It is very dangerous to make a decision from a controlled trust rating platforms. It is still safe if you had your own research towards the project, and make an independent decision.
yes a ranting site cannot be trusted completely in the rating given. the best is that you have to do your own research so that you understand the techniques when doing research and also the projects that you research. but the ability of research for new investors may still be a little ability and therefore new investors still think that ratings are pure results from a site's research