No one seems to care anymore, but a big issue that people were concerned about in the 2000s was the switch from 'I know more about me than the blob (corps, gov, etc) does' to, 'I need the blob to remind me where the hell I was that day'. Heart rate and blood oxygen data are hard to exploit data points but not impossible(1), but facing an accusation from someone who knows more about your movements than you do is an uncomfortable scenario. Of course right now, if you're facing an acusation of this type, odds are it's legitimate, or if not, defenseable, but that was the case 15 years ago in Türkiye, but isn't now. Things change.

(Note 1:"Dr. Bootlicker, the defendant wants the court to believe that she calmly placed herself between the agent and the minor he was trying to apprehend, and asserts that the agent's claim, that the defendant's actions constitute assault, is, in her words, 'ridiculous'. But am I correct in understanding that you view minutes 8 and 9 of the biometric data submitted to the court as characteristic of significant physical exertion that might be similar to that undergone by an assailant while commiting an assault?")