So what is the catch here? subtle advertisement? it's pretty obvious, everyone will say no to the question... -- assuming I interpreted the question right since it's poorly constructed.
In any case, they do appear to be shady as pointed out above.
It is not the first platform that I have noticed. Some platforms do this, whether they are paid directly or through referral links or a third party.
This approach is clear from beginners, so I do not advise anyone to trust any positive reviews, especially from beginners. Look for negative reviews and try to make sure they are accurate.
Bitget exchange spammer is a good example