Tire spikes are still often misunderstood for their intended purpose of preventing sliding.
The answer is that the tiny protrusions (vent spews) on motorbike tires are an inevitable consequence of the tire manufacturing process. Nonetheless, the functioning of the tire is unaffected by these tiny spikes. Actually, vent spews is the correct term for these fibers.
To avoid the formation of air bubbles within the tire, tire molds often have several microscopic vents that allow air to escape. When that occurs, these valves allow not just the air bubbles but also some of the melted rubber to escape. This is thought to be caused by vent spews forming.