https://www.pcgamer.com/valve-bans-dota-2-team-from-the-international-for-using-programmable-mouse/

Valve has disqualified a Dota 2 team from its upcoming The International 2018 for using a programmable gaming mouse. In doing so, Thunder Predator used an "unfair advantage", so says contest organiser FACEIT, during the South America qualifiers, which prevents them progressing to August's $15 million competition.  

As reported by Motherboard, Thunder Predator's AtuuN is said to have selected Meepo—a Geomancer, who is billed as "one of the hardest carries in the game to play effectively due to his heavy reliance on micromanagement." Meepo can create clones of himself, and when each clone teleports, they deal damage in the surrounding area. And while this cloning method can be a powerful means of offence, said micromanagement means each clone must be instructed individually.