As someone coming from the developers' side of the fence, with regards to the attitude of ownership of the data then developers (where there is a DBA function) do not own but are in part responsible for the data. This sits alongside a lot of other peoples' responsibility for the integrity of the data e.g. data entry teams.

I have talked about the data "being mine" against a DBA when in a development environment (where the developers define the database structure and develop the stored procedures) where a database has been assigned for the sole use of the development team (which may include a DB Developer) and a DBA external to the team has altered the schema in some way or removed or altered the data.