Never trust end users to take security into their own hands.
Jagex has attempted to educate players since Runescape's conception not to fall for scams or trust outside communication from them, yet players still fall for it daily. Allowing outsidel inks on the RS forums, even voice chat links, would require that much more moderation on Jagex's behalf.
Frankly I'd rather them put the time and resources that would be allocated for that kind of moderation towards pushing a few more clan updates through the game.
06-Jul-2016 18:40:57