I recently saw a WB for sale in Europe listed as wearing a fake tail in much the same manner that sweet itch or cribbing must be mentioned.
But no - I’d never heard of fake tails either till I moved to the USA. The average horse here has a sort of scraggly tail end that hits the fetlocks - banging 6” below the hock is unheard of IMEX - and then a massive fake tail usually made from slaughtered horses is tied on and they look really weird in person (to a Brit!) because they move oddly.