I used to work for Verizon Wireless and it seemed like every store had a creep with a hard drive full of stolen nudes. It’s unfortunate, but you should assume a tech can and will view anything on your device. I always asked for permission before opening a customer’s camera app or photo gallery and still ran across plenty of X-rated pics.
Then, there were the customers who would say their phone was broken, then hand it to me with a dick pic on the screen. Internet age flashers.