https://www.gamespot.com/articles/fortnite-shopping-carts-are-back-in-time-for-week-/1100-6460026/

It's not uncommon for Fortnite items to be added and removed, but the game's first vehicles--shopping carts--have been in and out an inordinate amount. Issues with the shopping cart saw the vehicle removed once again recently, but Epic has announced it has been re-enabled in Battle Royale across all platforms: PC, PS4, Xbox One, Nintendo Switch, and mobile. [Update: It turns out the timing for the returning of shopping carts is quite fortunate, as Week 9 challenges task players with using one.]