At the moment the reward system biases people towards a) Creating a lot of small utility mods b) Creating a lot of library mods to get more downloads in order to get a bigger share of the reward pool. Although I know it is difficult to find a good solution, the current system disincourages creating bigger mods especially on the long term (since those are more difficult to port to newer minecraft versions too)
Balancing and tinkering with the system is tricky and we're treating this very cautiously - Our first step is to migrate CurseForge smoothly from Twitch, including the reward system as it stands. After that we'll look into different option and how we can rework the system and address questions such as the distribution between separate mods, mod packs, content quality, popularity etc.
We have a lot to learn and we'll introduce any change if required gradually and adequately.