Board Thread:ROBLOX help and discussion/@comment-27013499-20140712223424/@comment-4812386-20140712235750

ROBLOX has actually released a filtering mechanism that, when used properly, can completely fix all exploiting problems. However, when it is used, local scripts are no longer able to change the game environment and must communicate with server scripts using remote event and remote function objects. Therefore, the filtering mechanism cannot be enabled systematically, hence why ROBLOX makes it usable on an opt-in basis. Unfortunately, not enough game developers are aware of this mechanism and many of those who are aware of it do not use it because using remote function and remote event objects is more difficult than modifying the game environment right away.

Regardless, the functionality to completely prevent exploiting in a game is there. It just needs to be used. If you know of a game you'd like to have exploiting stop in, I suggest contacting the game's developer and asking him to read the Security article on the official wiki and to follow the instructions in it to make his game safe from exploits. The more game developers do this, the least common exploits will be on ROBLOX.