https://motherboard.vice.com/en_us/article/3k49z9/dota-2-player-who-used-programmable-mouse-disqualified-his-team-from-dollar15-million-tournament

Valve has disqualified Peruvian DOTA 2 team Thunder Predator from competing in its premiere tournament The International 2018 this August because one of its players was caught using an off-the-shelf gaming mouse during a qualifying match on June 19. With more than $15 million in the prize pool, it’s a huge loss that highlighted the sometimes complicated nature of "cheating" in professional esports.

Cheating has been a problem in professional sports for years. Unscrupulous players, managers, and even entire countries will do whatever it takes to gain a competitive advantage. In traditional sports, cheating often takes the form of bribing officials or using doping with performance enhancing drugs like steroids.