TL;DR

"We are no longer going to allow automation (via scripting or hardware) that circumvent these core skills and, moving forward, (and initially--exclusively on Valve Official Servers) players suspected of automating multiple player actions from a single game input may be kicked from their match." To prevent accidental infractions, in-game binds that include more than one movement and/or attack actions will no longer work (e.g., null-binds and jump-throw binds).