No benefits. Just a way to help keep the bot completely free! Right now, the bot is provided entirely free of charge to anyone and everyone. The source code is fully open, and no user data is sold or even collected. Monthly contributions go a long way towards keeping the bot open to everyone!
I make completely free and open-source content. Some of my larger projects, like my Simple Stock Bot, cost a nontrivial amount of money to run, so all donations go directly into server fees and making my projects better.