How does numerai work?

Can you explain in simple terms how Numerai operates? I'm curious about how their platform facilitates machine learning and data analysis for crypto traders. Specifically, how do they gather the data, and how do traders utilize the models and predictions they provide? Is there a fee for using Numerai's services, and what kind of returns can traders expect to see from implementing their strategies? Additionally, what sets Numerai apart from other crypto trading platforms and services?