What are the tiers of Fideum?

Could you elaborate on the various tiers or levels of Fideum and their respective features or benefits? How does one progress through these tiers, and what are the requirements or criteria for advancement? Is there a clear hierarchy or path for users to follow, or is it more flexible based on individual performance or contributions? Understanding the structure of Fideum's tiers could help potential users better navigate the platform and plan their growth strategies.