It's a complex topic which requires the balancing of some things that may seem at odds.
Yes, digital sovereignty means owning your data and the means to transfer and activate it.
It also covers things like not having to relinquish a personal key or passphrase in order to do so, as that severely diminishes your personal security, erodes privacy and trust, and enables a future society where corporate participation is mandatory and the dissolution of security of privacy boundaries considered essential and unavoidable.
Such a system is horribly anti-consumer, even if it seems nice while the lollipop is still in your mouth.
