Microsoft has swung the ban-hammer once again, this time giving permanent Xbox LIVE bans to users who have been found to have "illegitimately accessed Xbox LIVE Marketplace downloadable content."
The announcement was made on the Xbox.com forums over two-weeks ago (quoted below), but it would appear that the bans have only been coming into place this week, with the official Xbox support Twitter account (@XboxSupport) receiving numerous complaints and requests for information.
Please know that we are being very careful regarding these suspensions, and have clear evidence regarding each account issued a permanent suspension from the service. We apologize for any frustration or confusion resulting from our inability to share individual details, and thank you all for your cooperation in this matter.
With Microsoft being unwilling to discuss individual suspensions, it is unclear if this relates in any way to the Xbox Reward glitch last month which saw 1000s of MSP given out in error, though it doesn't seem likely. Originally Microsoft did issue a statement telling people to "enjoy" them, before recalling any that hadn't already been spent later that day.