The difficulty with federation is you have to account for the federation policies all the way out the tree, not just the ones you immediately federate with.
server A federates only with server B.
B federates with C, D, F.
F "federates with everything."
whoops, Z is a bunch of nazis, and F just federated with them.
Congratulations, server A is federated with the nazis on server Z.
@pup Not really. Federation is direct. So this means I can filter out the Nazi's. And it's not a big deal.
@pup Stuff originating from them will always be filtered as well in boosts and such, since the originator is kept track of.
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