The account's played time on Steam; in Rust, a proxy for experience and a reason a server may accept or refuse a player.
Many Rust servers gate entry by hours played, and a high-hour account is trusted by other players. Listings state the hours; an account with thousands of hours and a clean ban record is the Rust equivalent of a high-level account elsewhere.
A ban recorded on the Steam profile, visible to everyone and permanent for the game it applies to.