Roblox has started an early preview of Scoped User IDs, a privacy change that gives players a unique identifier for each experience instead of exposing one global identifier everywhere. The goal is to make it harder to connect a player's activity across unrelated games.
The first rollout is designed to minimize disruption. Existing players in games they have already visited keep their current Global User ID, while new players entering a game for the first time can receive a Scoped User ID. Roblox says most games will not need code or DataStore migrations immediately.
The design mirrors how mobile platforms curbed cross-app tracking: Apple's vendor-scoped identifiers made one-ID-everywhere a privacy liability years ago, and Roblox is now applying the same logic to games. The friction lands on legitimate cross-game systems — studios running shared progression or ban lists across their portfolios will need the new linking APIs rather than a raw user ID.