I think a blackout has a much higher impact than deleting accounts.

There are so many users nobody notices when a few disappear. But when a subreddit goes dark it’s most certainly noticeable.

It’s evident by now Reddit management doesn’t care. Two days raise awareness amongst users. Maybe the two days won’t be the last for many subreddits or people. And I’m sure more people became more aware, or thought more about the situation and alternatives than without a two day blackout.