I have been looking for a service that uses federated servers.
Because I am paranoid. And because companies pay me to be imaginative in my foe analogies.
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We don't have federated servers right now but we do utilize open source, publicly accessible libbitcoin nodes which both Airbitz and 3rd parties host. This is a fully compatible replacement to bitcoind nodes but provides much faster blockchain queries, similar to Electrum servers. If you'd like to run one, we'll include it in the list of servers that our clients could access.
Our Git encrypted storage "sync" servers are also peer-to-peer but currently only we host them.