I trust the vendor to want to keep their name out of the papers. I don't trust an unknown individual possibly in their first job with no privacy training.

The amount of sensitive information I've seen in my circles alone being posted to Instagram in the background of a cheeky work selfie.. don't even start on the deliberate stuff like "hehehe this guy has a silly name" "hehehe aye he does (I wonder if anyone screenshots my private info and shares it with their friends?)"

I trust my vendor to supply me with genuine parts. I don't give the keys away to my vendors to fix issues. If you must, offload data from the phone and wipe it, then have it serviced. Just like you would remove precious cargo from the trunk of your car when you give it to a dealership service center.

I won't trust anyone, I would delete my personal data before leaving my device in the store.

Vendor != some repair guy in vendor's shop.