Why do esports players wear two headsets?

If you’ve seen an esports event, chances are you’ve seen esports players wear two headsets or event three. The reason for this is for preventing cheating at your esports event. How does this prevent cheating? The inner earbuds are for in game audio so the player can hear their game and teammates. Ie, Dota 2 audio, etc. The outer headsets (depending on setup) feed whitenoise OVER their in game audio so they cannot hear the casters, fans etc. An alternative is a completely sound proof headset without white noise and white noise coming in from their own in ears. A