Starting June 12, a significant number of subreddits are going private to protest the upcoming changes to Reddit's API, which will have a large effect on 3rd party apps. The updated API terms will go into effect on June 19th, per https://www.reddit.com/r/reddit/comments/12qwagm/an_update_regarding_reddits_api/ and API rate limits will change on July 1st, per https://www.reddit.com/r/reddit/comments/145bram/addressing_the_community_about_changes_to_our_api

This market will resolve YES if, before or on July 1st, Reddit changes any portion of the upcoming updates in response to the blackouts.