On a more technical level, it takes quite some ressources for a server to broadcast their communities to all other lemmy instances.
“Receiving” a remote community is just reading data and inserting it in your instance. But if a community is hosted on your instance, you have to send that data to each and every instances with at least one user subscribed to it.
So it’s really better for everyone to spread out on as many instances as possible. The only thing I would recommend before setting up a community (or your user account) on an instance is to check if you align with their moderation rules/code of conduct.
On a more technical level, it takes quite some ressources for a server to broadcast their communities to all other lemmy instances.
“Receiving” a remote community is just reading data and inserting it in your instance. But if a community is hosted on your instance, you have to send that data to each and every instances with at least one user subscribed to it.
So it’s really better for everyone to spread out on as many instances as possible. The only thing I would recommend before setting up a community (or your user account) on an instance is to check if you align with their moderation rules/code of conduct.