50/50 is better. When 75 /25 , 75 for stakeholders and 25 for content creators will make content creators less motivated. The effect is that POB will only circle among whales. There will be no fair distribution. New members will find it hard to get upvoted because the curators will hold their vote only for the circle of friends and closed members. As you can see that the trending posts are almost from the same authors.

When new members are not motivated, they will leave the platform and sell their few amounts of POB. This situation will make hyperinflation of POB in the market. Middle man of creators will also less motivated to post on POB. It will make POB an exclusive community. Once whales need to cash out POB on their holding, it will dump the price of the POB in the market. One thing that more content creators join is the reward system. When in a month, they get only few cents, they will leave this platform.