Some time ago, Microsoft released Halo: Reach on games on demand for review purposes. Only people with a code could download it. The problem being that there are people that want Halo: Reach more them Microsoft wants them not to have it. So servers got compromised and Halo: Reach was stolen.
Only a fool would download the game and play it online but for those who did the banhammer did not take long to find them.
Aside from console bans, Microsoft is also suspending gamertags who are seen playing it:
“Xbox LIVE
Notification of Permanent Suspension: Prerelease title play
This email is to notify you that your Xbox LIVE account privileges have been permanently suspended due to illegitimate prerelease title play.
Your conduct was brought to the attention of the LIVE Enforcement Team through the course of our operation of the service. The LIVE Enforcement Team has reviewed the evidence regarding this conduct and determined it violates the Xbox LIVE Terms of Use and/or Code of Conduct. Because your conduct is in violation, the Xbox LIVE Enforcement Team has issued a permanent suspension.
During your suspension, you will not be able to log into Xbox LIVE. Your Xbox LIVE privileges will not be reinstated.
Customer Support is not able to modify or provide any further details about your suspension.
Microsoft expects that all customers abide by the Code of Conduct. The Code of Conduct provides guidelines for appropriate behavior while using the service.
You can view the Xbox LIVE Code of Conduct from the Xbox LIVE Dashboard under Xbox LIVE Policies in Account Management, or by visiting http://www.xbox.com/live/codeofconduct.htm.You can view the Xbox LIVE Terms of Use by visiting http://www.xbox.com/live/termsofuse.htm.
Note: if you are not a user of Xbox LIVE, this suspension may have been enacted due to your activity in the Zune Social. You can view the Zune Social Code of Conduct by visiting http://www.zune.net/legal/codeOfConduct.htm. You can view the Zune Social Terms of Service by visiting http://www.zune.net/legal/termsofservice.htm.
Thank you,
LIVE Enforcement Team”