Anything that has a referral system means influencers are the ones that will benefit the most with these kind of projects.
I wonder how do users will get this ratings?

Still, an entry-level type of project where anybody can just join very easy. Just by looking at the number of users joined in a short amount of time, this will be saturated and if they will launch an airdrop, it will be oversaturated again just like what other tap-to-earn games are. As for the project, I don't see anything significant nor unique with it. Maybe this "Ratings" thing is what makes it unique, but what's the use case of the token? You will earn it if you refer friends and completing tasks, and then what? You will just sell it then. If that's the case then it's only a matter of time before the project will soon become a fail project just like others.

This rating-burning mechanism that you're saying will depend on how will the project be in the future. There might be some that might not care about their ratings for various reasons. Anyway, I didn't look at the project, but I wish them good luck... I guess.