A period is only 1 byte, so a CD can hold hundreds of millions of them.

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Yes, probably someone would like to, but they can’t.

I don’t know anything about health app in particular, but they posted some cool methods for finding highlight photos in your library using what they call “differential privacy” on their research blog.

https://machinelearning.apple.com/research/scenes-differential-privacy

I don’t disagree with that, but the point here was freedom from advertisers and general data privacy, not data portability.

But there is an “export all data” feature in health, though.

Not wrong. You’re arguing a different point than what they said.