Blockchain solutions may be preferable but I think a UI solution could help here. The format of the homepage could affect what is seen greatly. Instead of the latest top earners, show active or trending posts from a limited amount of the most popular tags. For example, every 15 minutes, randomly choose a few of the most popular tags out of the top 20 tags and show a few of the trending posts from those tags. Show the top trenders below all of that. This way people are exposed to more content but very popular topics can still easily be found. This should help spread out the votes to more content since "picking a massive winner" will make less sense if a wider range of content is being upvoted. And since whats featured on the homepage would be somewhat random, people wouldnt be able to predict what category to vote up so would presumably be more honest in voting on what they like.