This means the weapons only get better the more players using it. Another perk of the weapon named Parasitism does more damage to enemies based on the number of SIVA nanites that attach.
The ability of the weapon, The Corruption Spreads, creates SIVA nanite clusters on rapid hits and precision kills. Outbreak Perfected is a returning weapon from the original game, and it really does pack a punch. The new hot weapon for Destiny 2 players to have, is a part of an exotic questline.