Keeping it simple: It should be what has the best potential to give new exposure, attract users, retain an active community and create new network effect as content and engagement attracts new people.
But I think it is mainly on stakeholders and developers to create a platform whose reward mechanisms correlates better with what brings in sustainable value. And where creators and users don't have to think about much other than creating the best of their ability, making the most fruitful connections and having the most fun. That's what Will get people excited to share the platform with their friends.