My fantasy solution to all this is to separate PII from functionality. You would have profile providers and interaction providers, and any of us would subscrib

My fantasy solution to all this is to separate PII from functionality. You would have profile providers and interaction providers, and any of us would subscribe ourselves into the services we want to use, disconnecting whenever we didn't want to use e.g. Twitter or wanted to take a break. Within these joins, a person could control which of their PII they want to allow the service to have access to. You could run your own PII provider or join/pay for someone else to run it.