Mine are pretty specific but:
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I’m a bartender. I can get messages if the door person/security is having a problem customer while I am elbow deep in an ice well (plus phones are dirty so I’m not touching gross phone and then your lime wedge even if I am super religious about washing my hands with everything I touch behind bar.) I don’t wear it all the time but it is a useful tool.
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I monitor my heart rate cos I’m having health issues
Butttt… I don’t feel bad for these folks, mine came with my phone.
I’m making an assumption based on my experience in a smaller American city but they are a nuisance and left anywhere and everywhere. People like to throw them in bodies of water too.