Valve Anti-Cheat (VAC) monitoring on all competitive systems; Player PCs are provided by tournament organizers at LAN events (no personal hardware for system units); USB device whitelisting at Major events
Why people argue about this
People often think that anti-cheat measures in Dota 2 are only active during official tournaments, forgetting they're also monitored on all competitive systems at any time. But actually, it's a continuous process to maintain fair play and integrity across LAN events and beyond, not just limited to tournament settings as some might assume.