Few concern/problem,
1. Bitcoin isn't practical for micro-transaction, decent percentage of BTC could loss to withdraw fee (even if it's 1 sat/vbyte).
2. Moderating the community who have financial motivation rather than having fun (for example, compare this forum with other forum which discuss video game/movie).
More importantly, one major challenge is finding an income source to fund the money that the server will be giving away.
How about in-game advertising?