Can't have significant revenue impact if you don't have significant revenue.

[insert guy tapping head meme here]

Advertisers leaving Reddit permanently, as is the case with Elon's Twitter.

Biggest advertisers leaving the platform but I can't see them being so aware. Maybe if the largest subreddits stay indefinitely private until Spez is ousted.

So a call for sponsors to somehow join in on the action? How might that happen?

even if 90% of reddit stay down for a week, 7 days is only 2% of a year, so the revenue lost is below 2% of the yearly revenue (ignoring seasonal fluctuations here for a moment). I doubt that any company, large or small, would even notice a dent from those 2 percent. Especially since traffic also went down a bit and probably offsets some of that loss

If the vast majority of Reddit ad-views are people doom scrolling, it doesn't matter what content they have as long as they have something.

If the vast majority of ad-views are people coming in from Google, et al, then the revenue impact will hit once the blackout lasts long enough, or if mods start deleting subreddits.

https://onlinetextsharing.com/operation-razit-raze-reddit might.