I never understood why people thought this would be a good thing. Growth for the sake of growth is meaningless. The best way to grow the community is by attracting sane people who are capable of having adult discussions. Focusing on a number of users is misguided. What really matters is sustainability. The only things that actually matter are having enough users to create content, having sustainable development resources, and enough funds for hosting the community.
Having a bunch of radlibs swarm Lemmy doesn't really add any actual value, and creates no end of problems. Thankfully, we can at least mitigate the damage thanks to federation.