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 ?
Definitely yes, it also involves money. Some websites are faking ICO ratings in exchange for a certain payment to attract more investors. We shouldn't trust even reviews because these things could be manipulated and might being control of either bounty hunters or the developers. Do your own research and analysis but don't be deceived by fake information.