Greetz
Leet-spelled greetings in cracktros, intros, and NFO files — name-drops to friendly groups and individuals, the scene's version of an acceptance speech.
A rolling scrolltext might devote half its length to "greetings to" followed by a long run of group names. Being mentioned was currency: it confirmed you belonged to the circle and stood on good terms with the sender. Being left out — or getting a barbed greeting — said just as much.
The spelling with a z is a holdover from the same leetspeak that gave us warez and skillz. The practice carried over from the 1980s cracking groups into the modern demoscene.