Reddit

It's going to take at least a month to really see the effects. Once the apps go dark on June 30th, the number of mods leaving will rise, and the spam, garbage and low-effort crap they were filtering out will quickly start creeping back. But it's going to be a gradual thing and a slow decline, not some big abrupt meltdown.

Reddit's one of the biggest and busiest websites on the planet, there's a lot of inertia and it takes a while to even notice when something that big starts to list.