The Great Whiteout, also known as The White Void or the Anti-Void, was the event that signaled the end of r/place 2022.
Starting at 82:04, players were only able to place white pixels, thus forcing the canvas to return to the blank state from which it started. All artwork was gradually destroyed over the course of an hour, until the canvas was turned completely to white at 83:19. r/place officially ended thereafter.