https://www.databreaches.net/blackcat-claims-they-hacked-reddit-and-will-leak-the-data/
As if Reddit wasn’t already having serious issues these days, they have allegedly been hacked by AlphV (aka BlackCat), who write: Operators broke into...
It will for certain subs because they need that anonymity to talk about certain subjects that they would be persecuted for if done in public. Think LGBT+, leaving certain religions, having different political views that is massively discouraged if not outright banned in their location, having certain medical procedures that are limited if not outright banned in their location, etc.
"Leak, or leak not: There is no '...will leak'."
-- Yoda
Claiming that "you're gonna..." accomplishes nothing, and paints a target on your chest. Also it tips off your adversary and allows them time to: