They developed the API and let developers use that API. Of course it is Legal. Try researching about API ;)

That's why bungie had to do a quick hotfix to lock out megaman / other dataminers. And that's why they banned anyone glitching/datamining into new areas? Right?

Sorry but it sounds like you are a pretty young and unexperienced fellow. First of all glitching into a built in map has NO relevance with the so called datamining or what bungie patched. Bungie patched the API so that future content will not be revealed before it is published on websites like Reddit. They tried to keep the surprise and continue on their efforts on manipulating Xur inventory. They also tried to ban the players whom glitched into built in area's because those glitches clearly put out one of the important proof that Bungie cut and changed game content prior to release. Yet i can also clearly say that all my points are my and many other first day players opinions You can feel free to disagree but all you do is just showing yourself as a bad consumer. You are complaining to gamers whom feel cheated in many different ways by Bungie. You should first learn how to become a good consumer because without that , you'll be the perfect customer Luke Smith dreamed off : The one that throw money to TV when asked...