Google can turn ANC earbuds into a heart rate monitor with no extra hardware

I want ANC so powerful it blocks out my intrusive thoughts

This tech seems cool for people who may need it, or even just for fitness or other things.

But if Google is behind using the data to whatever money purpose (like selling ads), it becomes a bit bad.

Tho they would already do so with watches or other health tech connecting to their services. So 🤷. If people have already choose a Google product for health, it doesn't change much, it's just another cool tech to the collection.

I wonder if this tech could come to other ANC headphones, or if Google will keep this proprietary.