Hey guy’s, can someone try explain this to me, i’d be happy to hear from Gamer or 343/Bungie, either one would help 
Since the release of Halo Reach there has been a exploit in a certain loophole/glitch involving the use of two account, one online one offline, and the reset of Challenges.
What I need explained is, is this a loophole or a glitch?
I am at the understanding that you cannot get banned for exploiting a loophole that has not been fixed for the passed 6 years. This is what happens, do your Challenges as normal, then go back to main screen, log out of xbox live, log into a local only account, then presto they are reset. I wanna know, can you be banned for this? Such as, even if the event was situational. For instance I have a 8 year old that plays on my console and I made her-her own account, this is how I came across this loophole/glitch before researching it. She logged on, after I did my challenges, I log on when she went off, and they where reset, so I made a total of around 22k in one day.
Can anyone tell me if you can actually be banned for exploiting this, as it is the fault of Xbox Live, Bungie, and 343 for ignoring it for 6 years? To my knowledge, when it’s a ending result of a saving error happening from two systems clashing incorrectly, it’s not the players fault? That’s what I think anyway, i’d like to know more on this subject, and to know if it is a bannable offense, despite how it is caused, keeping in my mind that my friend has been doing it, to my shock, for nearly 4 years with no consequences.
Side note - In my research I found that nearly 4,000+ people have been exploiting this loophole/glitch, even showing full gamer-tag doing it over YouTube with no consequences, earliest video dates 2nd November 2011 (No idea if that video was from a Beta, if there was one)