Barely event matters, if your great aunt sends her DNA to some online heritage service, the game is basically over. Unfortunately, like it or not, your DNA isn't yours.
Like it or not, politics is not a singular immutable thing. We can reframe things, just as governments do to justify their garbage. Society is but putty, and we can mold it to our liking, or sit quietly like livestock and await government to decide what we're allowed to think and feel.
The current trends seem to go against this, saying that even things like image, voice, or memories about us are all somehow private even in a public setting, and cannot be used without a permission of their owner. DNA is essentially in the same category - even more so, we leave it just about everywhere, yet most people think about it as something extremely intimate, much more so than a picture from a public venue (where opinions sort of diverge).
And whenever I agree on disagree, I can totally understand why this is happening and why the current trends are like this. It's basically a reaction of the society trying to protect itself from abuse by the entities of similar (large) scale.
All this stuff is basically a (relatively) new dilemma of the information age, where we've gained an ability to store, analyze and transfer large arrays of data efficiently. Paired with technologies (such as cameras or sequencers) becoming more affordable to deploy at scale.
Sadly, consumer technologies (empowering "normal" people) drastically lag behind business and government tech, so before your casual Joe ever gets a chance to have some meaningful (and not really privacy-breaking; although there's rarely an incentive to develop tech that doesn't break this) use cases, large corporations and governments ruin everything.