Why are Rockstar staff frustrated about GTA 6 leaks?

Rockstar developers have reportedly been growing frustrated as a steady stream of GTA 6 leaks — covering characters, missions and the setting — kept surfacing online ahead of the official reveal, undermining the tightly controlled way the studio usually manages information [1]. That frustration was compounded by ongoing security concerns tied to the disclosures, though the main leak channels have since been taken offline, which may point to Rockstar's legal action having an effect [5].