One of the effects of capitalism is that people are conditioned to think as growth in quantity is the end goal of all human activity.

This makes it harder to realize that, as far as the Fediverse is concerned, at very least, Lemmy and Mastodon have achieved viable self-sustaining networks and that driving inorganic growth by targeting users in other platforms would reduce the viability of the network because it makes onboarding new users harder. An example of this even inside reddit was when a subreddit got a sudden large influx of new subscribers they invariably lost what made them stand out in the first place.