Shadowban all users. Respond to their comments and posts with AI generated responses only visible to the poster. Redditors famously don't want others to know their handle so they won't share it around. You could only tell from a signed out device reading something you commented in.
Flood the site with generated posts and 'engagement' that is all ad friendly. Turn the whole place into Weenie Hut Jr.
Do this pre IPO then bail forever.