It's not actually "ownership": You have control over it, but you don't own it, and laws are careful to make that distinction. I emphasize this since at least in parts of the debate, people advocating for "data ownership" are advocating for weaker data protection laws, with the idea that rights derive from ownership of data means companies can gain ownership of data too, and you then do not have those rights.

You have rights to your personal data, you do not need to own it to have those.