I'm not so sure - I assume the hyper-valuable users are actually generally using 3rd party apps, so forcing them back on the platform could raise their CPI enough to look good at an IPO rather than terrible.
I say this in jest, but only partially... lots of subreddits have noticed influexes of AI bots recently. Maybe spammers testing the water, or maybe you were just the product that was just helping train its replacement.