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.
By your link, there are enough exchanges where R-token is traded. And the trading volume is quite acceptable. Not bad at all. If desired, your bounty participants can be exchanged for crypto. For example, Bitcoin, which on the last day has grown very well in price.