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It isn't a full blown DeFi farm. Mainly the contract is just to buy it and earn additional MoonRat and earn BNB as well.

https://docs.moonrat.finance/innovation/earn-bnb

So just holding moonrat gets you some bnb? 🤔

Yeah but I would sit back and watch the project for a big because the devs have to fix a bug in the code right now and are going to come out with an update.