Self hosted personal data
My name, address, bank details, credit card number should be self hosted by me or by my data provider - I shouldn't have to give the data to every company that asks
When I move homes I have to change my address in all my accounts. If my bank details change, I have to do the same.
What if my personal data was stored in one place and all companies retrieved it when they need it? They don't store it.
The number of hacking targets drops to one central data provider or my own computer.
I can change my email address in one place.