I'd like a clear answer on this too, my preference is an in-game quest to 'convert' your tub to cloth, but a definitive 'we're letting this one pass', or 'we will delete the modified ones' would be useful.
Since those already in the game have almost certainly been used to make masses of cloth, and there are public ones set up for folks to use, it seems a bit late to try policing it out of existence - and that's never worked on 'illegal' items before so trying again seems pretty silly, really... best would be, if it's not a game-breaking item, to just make a legit way for it or it's equivalent to exist and move on.