Originally Posted by
Gaidax
Blizzard and heck, industry as a whole, offers these gateways, APIs and exposes features because it allows to make their products better and more used at much less effort.
Blizz does not need to make rio or anything "disappear" by bunkering up, quite the contrary - they nourish these community tools and resources, then they absorb parts of it that stood the test of time and are accepted for the fraction of cost and effort it would take otherwise.
One of the greatest things with WoW as MMO, is how moddable it is, how exposed its stuff is to creators - it is a big part of success story of WoW.