Do the reviews pass any checks on Revain before publication. if so, how is this done?
You mean manually, by people? Before publication no. After - yes.
In ann you answered me that ICO is completed back in 2017, so I checked CMC and your coin is tradable. Price is 0.11$ for 1 token, so how can 300 tokens worth 300$?
You are talking about R token
https://coinmarketcap.com/currencies/revain/Rewards for author of the month competition are in RVN. RVN is Revain's second token and it exists only inside the platform. You can swap RVN for R.