> Federated services have metadata as well.
> If a particular communication involves two different servers now *both*
> servers will have all the metadata for that communication.
Indeed, hiding all the metadata is *hard*.
Still, Having the overall metadata divided among a hundred servers or
more reduces significantly the amount and quality of information
available at any given server, compared to having it all centralized on
a single service for whole world.
In any case, I don't think that is the main benefit. I think the main
benefit is that it makes it easy to move from one provider to another,
which completely changes the dynamics.
Stefan
