I thought long and hard about this, and you're right. If it were me, no matter what the new username is, I'm still going to be mad. But I feel like I'll be less mad (just a little bit less) if they select a completely random username (with sensible length, like 8 characters or less), indicating it's chosen by an impartial random number generator instead of chosen by someone who in my mind is messing with me (image of Elon Musk laughing at me coming in my mind).