Just like what other user suggested you could visit
https://www.btcgosu.com/ it's one of the most popular review site and also what I used when looking for a bew good gambling site to play with.
I don't think that he wanted to play because as I understand to OP, he wanted to give some reviews and put them on their site. This probably talks about paid reviews and make them top these gambling sites and ask money for their good reviews which is common these days now just to attract gamblers.
I don't think that this was a good idea, of course, not. Legit/reputable gambling sites need not pay people just to rate them good but have it voluntarily sends their reviews and feedback for free, and base on their personal experience.
The player can leave a positive review if he really enjoyed the game, even if he did not receive a win. And he will do it not in order to receive some kind of reward, but as his gratitude to those who helped him feel the pleasant moments from the game. If I like casinos, why don't I tell others about it.
