I have a conceptual question:
When sending to a Data Extension, the contacts sent to are automatically added to All Subscribers by their Subscriber Key.
As far as I understood, no other fields from the DE are mapped to the All Subscribers list.
I noticed that, in my case, there are several fields from the DE appearing in All Subscribers after sending the email.
So my question is: how/why does Marketing Cloud map these other fields to All Subscribers?
Is there a way to remove any of these fields?
I'd be glad to provide any additional details if required.