Ethernet splitter
What kind of splitter? Not a hub or switch, just a passive splitter?
Those do exist to do 4x 100M links on a single pair each, but you can’t just plug those into a router or switch and get 4 ports, it still needs to eventually terminate as 4 ports on both ends.
That sounds great and all on paper but that also requires a ton of moderation overhead as now every small instance has to have enough mods to deal with everything being posted, since moderation would be local only. So all the spam and CSAM would have to be taken down by each individual instance. Would also somehow have to find a way for instances to pull the hashtags out of every federated instance too. The way it works on Mastodon is someone follows an account and that causes the data to get pulled in. On Lemmy you don’t follow users, you need a way to pull the data in.
The end result would be a mess of instances not even agreeing on vote counts with vastly different comments too, and even the posts.
Lemmy doesn’t aim to be an uncensorable platform. I join communities for the content, the users, and for better or for worse, the mods too.
The individual problems of having to deal with the duplicate communities will get worked on eventually.