However, you are forbidden to touch them. Trademarks, intellectual property rights and copyright law mean advertisers can say what they like wherever they like with impunity.
Screw that. Any advert in public space that gives you no choice whether you see it or not is yours. It’s yours to take, re-arrange and re-use. You can do whatever you like with it. Asking for permission is like asking to keep a rock someone just threw at your head.
You owe the companies nothing. You especially don’t owe them any courtesy. They have re-arranged the world to put themselves in front of you. They never asked for your permission, don’t even start asking for theirs.
Banksy: Wall and Piece