Looking at Reddit data on BigQuery, the number of sitewide submissions has been growing steadily, despite the continual drama: https://i.imgur.com/V8AptYU.png

Query to reproduce:

   #standardSQL 
   SELECT TIMESTAMP_TRUNC(TIMESTAMP_SECONDS(created_utc), MONTH) as mon,
     COUNT(*) as num_submissions
     FROM `fh-bigquery.reddit_posts.*`
     WHERE (_TABLE_SUFFIX BETWEEN '2016_01' AND '2018_02' OR _TABLE_SUFFIX = 'full_corpus_201512')
     GROUP BY mon
     ORDER BY mon