An open source website to watch subreddits going dark
As of 12:56pm GMT (7:56am central time), 7742/8299 subreddits are no longer public
The information I initially posted is misleading. Thus, I have edited the title and this content area to report accurate numbers.
As @roofuskit mentioned, the 8299 number is the amount of subreddits that committed to going dark, not the total number of subreddits, which is over 3,000,000.
I think the best Reddit blackout trackers are the ones that highlight the most popular subreddits, like this one showing 204 of the top 250 are dark: https://save3rdpartyapps.com/