There are 'illegal' golf balls that only fly straight for struggling golfers.
Amazon.com : Polara Ultimate Straight Premium Golf Balls (Handicap Range 12+) - Hook and Slice Correction - Perfect for Recreational Golfers - 1 Dozen (12-Balls) - 2pc Construction of Central Core and
Amazon.com : Polara Ultimate Straight Golf Balls, Designed to Correct Hooks and Slices, Perfect for Recreational Golfer, Matte White, Pack of 12 : Sports & Outdoors