I get that point of data actually being kept at one point, but other server can also save that data if the POC service makes a point to signal other servers (That's the whole point actually).
But what about the auth data? What if the POC service deletes then how does the other servers authenticate that user since the POC service is not there anymore, maybe I am not getting the auth part yet for Fediverse.
Too many questions that I need to research on.