They have been called many things through the years. Not a new idea. It traps all things. Water, mud, dust etc..
I bought a bike that had them that had been sitting for a couple of years. Forks had huge pits in the chrome. Dumb idea. My first trials bike had a set. The bike came from the original inventor from 1971. I bought the bike in 1973. I could find a pic if anyone is really curious.