Your friend friend should do the exact opposite to what I did...recycle it with Apple.
Unless it has some sentimental value or can be used as a WiFi remote for Home perhaps?
You see, I still have my OG SE from 2016, was meant as a "backup" in case the Mini 13 fails, was meant as a "WiFi-only play phone" for my kid, who got an android phone with a humongous screen instead. The 6S and OG SE pretty much share tech. If software supports function then perhaps it can still be used as an emergency secondary device, to take to the beach and not worry about its loss too much?
Either way, my SE won't be going anywhere outside of my home...unless...who knows.