Looking at the Linked Instances, most instances have at most a few hundred instances linked. What happens when there are thousands, or possibly even millions? Could too many instances require significantly more powerful hardware, or even be impossible altogether?
In other words, it’s better to have multiple of the same communities among different instances, and not too big either?
Generally I think duplication isn’t great because it means people subscribe to all of them and cross-post in all of them. A lot of client apps don’t deal with this well, yet.
I mean just have a community for cats on instance 1 and a community for dogs on instance 2.