Servers are ordered by their average players over the last 7 days, raised or lowered by how that compares with the week before. A server that was unreachable for more than half of its checks does not trend.
Projects are ordered by counted downloads and saves from the last 7 days. Recent days count more, a save counts as three downloads, and a release in the last week gives a small lift.
Scores are refreshed every hour. Nobody can pay for a position.