Twitch recently issued a statement that streaming content on Twitch that violates third-party terms of service or other user agreements is a violation of their ToS.
This includes cheating in online multiplayer games as defined and enforced by the game developer.
Over the weekend, Twitch made it clear that this policy also holds true for Pokémon GO content on Twitch and that they will be enforcing it.
Starting today, anyone sharing content that features or promotes cheating in Pokémon GO will receive a strike on their account.
via Twitch Blog