Most data shown so far looked at the Peak per Minute numbers, so I wanted to see the day data instead.
I took the data from the blackout.photon-reddit site source.
It seems that it makes a Reddit Api call every Minute searching the newest Post and Comment and calculates both per Minute rates.
I wanted to see the effect the Blackout had over the day, so I summed the data and plotted it. Seems like between 11th and 12th June the comments/day diminished by -19.2%. The posts/day saw a decline of -8.9%.
I have also been looking at the Subreddit Stats: Most comments and posts come from r/Askreddit. On 13th June the Sub had 2.4% of the total comments and 0.44% of the total site posts. Sadly I can't see the list of the most commenting and posting subs from reddit before the Blackout because it doesn't seem to work on wayback machine.
But currently it seems like the Top100 commenting Subreddits only make out ~10% (Askreddit: ~1.5%) . So the bulk of the comments happens on the sheer number of other active subreddits.
The subreddit stats site also doesn't show how it gets the data and doesn't make it easy to see historical data overview. During the Blackout there seems to have been post spamming from a now banned german nsfw sub that had even more posts/day than Askreddit
I forget where I read this, but something like 15-30% of reddit users third-party apps. 19% dip sounds like some of that group continued using Reddit while a majority either stopped or found Lemmy/Kbin.