Search for files where users can make the files available through a simple HTTP server. From there, a central server, using PHP and MySQL for example, can search HTTP or web servers without hosting the files. It can also offer other tools like likes, comments, etc. In other words, it would be a file search system based on the basic HTTP protocol, storing links in the database for direct access to the files (without heavy intermediary pages).
Create a system where users can invest in a file. This way, they can profit or lose depending on whether the number of likes the file received this week is higher or lower than it received the previous week (or in another time interval).
Develop, in the long term, a decentralized system to monetize file transfers. Similarly, a system that can recognize which user owns a file, link, or hash.
Create useful tools that users can utilize even without a database.
Build a tool capable of rewarding users who provide the most popular or relevant files.