IDK, I think almost all interesting data has no obvious single owner, because it gets created as a side effect of an
interaction between two or more parties.
Take the transaction information from example above. The record of you buying products X, Y, Z for total t=x+y+z at time T, with card C - both you and the store could argue they're entitled to it. It's about you and money you spent and products you received, but it's also about them and the money they received and the products that were taken off their inventory. Then the card issuer will interject saying, "hey, the customer uses a card we provide as a service, so we're at least entitled to know which card was use to pay, to whom, when, an what the total amount was!". Then both yours and stores' banks will chime in, and behind them, also the POS terminal provider.
Truth is, they all have a point. We like to think that paying for groceries with our watch is like a medieval peasant paying for fruit with metal coins at a town market. It's not. Electronic payments always involve multiple steps handled automatically, in the background, by half a dozen service providers linked by their own contracts and with their own legal reporting requirements, and each of them really do need to know at least some details about the payment they're participating in.
A simpler example: this comment. It's obviously mine. It's also a response to you, and it only makes sense in context of the whole subthread. Should anyone reply to it, they'll gain a stake in it, too - and then, arguably, everyone following this discussion have a right to read it, now and in the future. After I hit the "Reply" button, I can't in good conscience claim this comment is mine and only mine. This is why I'm personally against the practice of unilaterally mass-deleting of comments on open discussion boards, like e.g. plenty of people do on Reddit, forever ruining useful discussions for the public.
(It's also why I like HN's approach to GDPR, which is, you can get your account disassociated from your comments, and you can request potentially identifying content be removed, but the site won't just mass-delete your comments automatically.)