It's much more strange to me that people WOULD let strangers use their cell phone. Back when it was just a phone, sure. But now it's my wallet with all of my credit cards and banking loaded on it, it has all of my passwords and all of my OTP apps and codes, it has the ability to unlock doors in my house (and for some people to open and start their car) it contains all of the contact information for everyone I know, it effectively has every email I've ever sent or received and every picture I have ever taken or been sent, it has access to publish content as me on trusted social media profiles. Yes, obviously all of this should be protected by much more than just physical security. But we all know that software locks can almost always be broken if you're in possession of the physical device.

I happily help strangers when I can, but I'm not going to hand over the keys to my entire life, on the most fragile and expensive object I probably have on my person.