I guess we have to wait for the 2028 Unreal Keynote speech, where Epic Games finally announce that they are implementing a “Delete from Vault” button.
They made a great play on making the Unreal marketplace available to all game engines. I can tell you those other developers in Unity, Godot etc will laugh at the Unreal market Place Store, if users cannot delete any previous Assets. It is so lame. Epic and Unreal is supposed to be so cool, and it cannot even implement a simple delete button. What a bunch of losers.
(BTW the rest of the Unreal Engine 5.1 is simply Awesome !)