After reading your post I thought to myself... hmmmm I wonder that’s true. Then later today as I am opening the door to let my kid in a small black spider is hovering on a single line of web, inside my doorway, saw me and started scooting back up. I killed it immediately and then thought, oh my gosh, that poster was right!!!
I’m thinking maybe some places in the arctic zones might be relatively free of spiders. But even if you don’t see them because they are under the floor or inside the walls, they are certainly nearby anywhere it is warm enough for them to move. Probably even on the space station.