Don't host the game. If you host, the cheats will work for every player. And everyone will have their oficial map replaced by the collided you hosted.
I'm 100% sure, you can test it.. tell some1 using oficial map to join your collided host, activate -setdm x and it'll work for him too (meaning the map got spread to him=).
Btw, to everyone talking stupid things about 1.23, the fact the new patch uses sha-1 doesn't mean its safe :\, I know people experimenting with 1.23 using alternatives workarounds.
Even if
Dota recodes SyncStored, it's still no problem because of warcraft inherent flaws.