Reviews also need to be monetised and the best wy is to make sure you are doing them with some profit, like getting paid tips by people. If you monetise by the casinos that are reviewed you would not be able to be independent and the public would loose confidence in them. To get tips and audience you will need to often update the reviews to get good rankings in searches.
I do not think anyone or any gambling site may give tips for monetise reviews but they may get some tips only from new gambling sites. And only new gambling sites may pay for reviews. I do not think any reputed sites may give any tips or may inspire any review sites. They may for only for those review sites which are too much reputed and which may affect their business, nothing else.
Hi friend, I believe @paxmao is so much on point, only that he did not explain it well. As a fact, this is what is happening in real life, everything is monetised for the marketing's sake so that the company/casino stays atop in their games. You do not trust most of what you see as reviews these days, and the only reviews you may trust are the ones coming from forums like this and also those from websites that allow external people (both registered and anonymous) to write their experiences. Although, some fake reviews would still slip through by this means, overall, one would be able to know the truth on average after reading most of the reviews.
But those reviews that you see on controlled websites are often monetised as @paxmao tried to explain, you never can trust such reviews. They can monetise them through direct cooperation between the website owner and the casino. But in case they are just an affiliate, they will embed their links. Even under the affiliation too, some better/personal packages are given to some people which is higher than the general rates that can be generated through the normal affiliate codes. All these are enticements that motivate the reviewers to work tirelessly for the casinos since it is in the form of partnership, meaning that they can do anything to make them succeed so that they can have higher gains too. This is also the reason why you see companies/casinos fighting for the top spot of search engines, but this might not directly be the work of the casinos/companies, but their agents desperate for the money and using any means necessary.