Since bots are completely unaffected by smoke bombs, the only thing they can do on a DTV server is block vision or cause FPS issues for allied players.
There's no reason to carry smoke bombs other than trolling your teamates. On top of that, your items get replenished every time a new wave spawns, so you can constantly harass your team with them.
It gets tedious asking people to stop and there's no reason for them to ever be used on DTV. Anyone against having them disabled?