I don’t normally blindly down such comments, but without credible explanation and evidence of what you mean, I made an exception here.

Seconded. One of the first foss projects I donated to :)

I am going to absolutely take this at face value without checking any of the text because anything that is so well written, must be true! Thanks, I learnt a heap from this.

No harm done

Oxygen is OnePlus’ proprietary OS.

As another has commented, medical devices (and especially pacemaker systems) are well regulated, such that misuse or illegal re-selling of patient health data is not worth it for most companies.

Cybersecurity is a big topic in the industry now and life-sustaining systems are scrutinised much more closely these days. I wouldnt be worried, but you can ask the company directly if you are still concerned.