Since Jagex is apparently a member of the "Fair Play Alliance", which allegedly doesn't tolerate cheating in video games, it's even more imperative now to get rid of Treasure Hunter, which is exactly that: cheating with your real life wallet! > )
David James
said
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Besides, it's not like there wasn't already illegitimate P2W/MTX in the form of RWT (especially rampant at the highest level of players) already. All Jagex did was make it easier/safer/cheaper for the regular player whilst taking a cut for themselves.
You make it sound like Jagex barely contributed to the issue of P2W by offering their own Treasure Hunter service, but it's quite the opposite:
RWTers, whether those that offered bots or already-trained accounts to willing buyers, had to use the same legitimate training methods as the legitimate players, meaning that both RWTers and legitimate players had to put in the same amount of in-game playtime to reach the same goal (assuming the exact same method was used).
With Treasure Hunter, it is the absolute fastest method of in-game hours to reach a skill level goal, and it's impossible to fight against the real whales that unload excessive amounts of money at TH, since they won't even risk getting banned. Against bots, you could still beat them in the long term as they'd get banned eventually and you both had to use the same legitimate methods, and even against people buying legitimately trained accounts, they can get banned for RWT and the real account owner can recover the account back from whom they "sold" it to.
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Regarding everything else, to keep it short, if you let MTX fester, sooner or later it'll get even worse and you wished you hadn't let it spread further. Ironmen might be a target next to sell P2W MTX to (Jagex could find a way), or more and more content might get extra monetized beyond just membership.