That's interest on the side of the data consumer not the data provider, for lack of better words.
If the bank was the one owning the information they would not want it to be shared with others as that would allow their client to easily migrate to another bank which they definitely do not want.
But as the one receiving the data,sure, it would be nice to have others share it with me, they'd say.
I'm afraid without legislation data sharing is never going to be a thing.
At this moment that bank is the entity that keeps this data. Their challenge is, however, that the data gets outdated. But if they give other parties the ability to access that data, then the consumer will have more motivation to keep it up-to-date, and the bank will now have access to more accurate address data.
(Note that the bank is an example - it could be another party.)
The solution for this would be for banks to use the government as single source of truth - in Germany we have the Melderegister anyway, it's mandatory to register your primary address.
Unfortunately it's not allowed by law that a consumer gives "push access" to e.g. banks, health insurance or employers.
If the bank was the one owning the information they would not want it to be shared with others as that would allow their client to easily migrate to another bank which they definitely do not want.
But as the one receiving the data,sure, it would be nice to have others share it with me, they'd say.
I'm afraid without legislation data sharing is never going to be a thing.