I watched my friends account get “banned by an administrator” for no reason

I have a level 99 hc ssf character that has many riches from playing a lot this league. I transfer gear from his stash to other leagues (make a new hc ssf character, fill his inventory with valuables, transfer league to hc trade, dump loot, delete character)for when I play with friends so I can sell the stuff I don’t need in hc ssf in other leagues so the gear isn’t wasted and gets used, and I get currency like divines. My friend who hasn’t played in a while joined the hardcore trade league, I’ve been helping him craft giving him lots of currency I EARNED, and after giving him some of my favorite items he was banned. It literally said his account was banned by an administrator, when I’ve played with him almost the entire time he has been online. I would like to know why my friend was banned. He has no reason to cheat I am someone who plays this game constantly and I’m giving him everything he could need. I have 4000 hours in this game, I bought a supporter pack and plan to buy more, I support everything about this game soplease help us so we can continue to enjoy your game. I literally gave him an ancient jawbone to sell for me cause I didn’t have gold in this league and he was gonna give me the divines back and you just ban him?

We were both on PlayStation he was sharing his screen so I watched this happen shortly after he put some stuff up for sale that i gave to him