-1 Disagree, trapping is allowed on a lot of days, including War day and plenty of LR days. Any kind of illegal trapping can just as easily be done with any other stickybomb launcher. This is like banning the machina because it can penetrate, or banning the phlog for its crits. Banning weapons individually in jailbreak because they're easy to break rules with is only a bandage solution to a much bigger problem, a lack of any requirement to play on BLU, and the inability for staff to react in time occasionally.
As for banning Demoman as a class is silly, Demoman can play a niche yet valuable role in crowd control on BLU during mass rebellions, such as stopping lots of reds in their path effortlessly if the player is smart enough. Sticky trapping is not at all demoman's primary aspect, his primary aspect is and always has been versatile crowd control abilities in choke points via spam, and having quick abilities to deny enemies from making it through certain areas via stickies and rollers.
As for unbanning sticky trapping, also going to be a no from me. These maps were fundamentally not designed to be able to be trapped on while still retaining balance. DYNF Minecraft (The most commonly played JB map on WL) only has three ways to access ammo besides the front door, all of which can be trapped near quite easily, and since it only takes two stickybombs to kill a light class (or one if you're decently close enough), maps would become further unbalanced (Even more than they already are, which is a lot) in favor of the BLUs.