Many subreddits could be spun off into a dedicated app .. WallStreetBets is a prime candidate as an app can add value by way of real-time & historical data https://twitter.com/2irl4u/status/1272282315511791616
There's whole categories of "things which could be spun into dedicated apps"
"bash scripts can be spun off as apps" such as a job scheduling SaaS (cron -> http://iron.io ) or a log monitoring SaaS (tail -> loggly)
"AWS services can be spun off as apps" including those that wrap AWS services (SES -> Sendy) or replace services (S3 -> Backblaze)
Apps that $MegaCorp purchased and ruined https://twitter.com/jasoncwarner/status/1282818245477769217?s=19