

It’s not just getting your communities seen.
Content from other instances for you and your users won’t show up in the all feed unless someone on your instance (or a bot) subs to the relevant communities.
Only off-instance communities with at least one local subscriber will federate.
You also wont immediately see new instances and their communities, and they won’t see you.



















This particular thing IS a common-sense technicality. Without it, every new instance, the second it came online, would start to try and mirror THE ENTIRE FEDIVERSE.
The ideal would be some kind of in-between, but that’s a lot more complex, and involves the developers making decisions for you in terms of what to pull in and what not to.