One of the tensions between federated services (DNS, SMTP, HTTP, etc.) and non-federated services (Twitter, Slack, Facebook messenger, Signal, etc.) is that quite a bit of control (perhaps all) is delegated to the single operator in the non-federated model.

I don't think you are going to get "computing freedom" via a non-federated service regardless of how you define "computing freedom". Autonomy and independence aren't part of the equation in that context.