We're all living on r/MadeMeSmile's Internet Now

The linked post has some analysis of Reddit's loss off traffic based on SubredditStats data. I noticed the same trends when I was looking earlier but some of the drop-offs look so dire that it made me think that maybe the data collection broke. Any idea how they get their data?

Edit: there is some discussion of this over at [email protected] too. lemmy.world link to that thread.