It's not just a terms of use for XBox Live. It's a Terms for using the console.
When you buy something, there's a little slip with terms. Those terms usually stipulate some form of return or accept policy. This is called a "shrink wrap" contract.
Because the XBox360 is a media device, a term saying something to the effect of "Warranties and continued use may be voided upon modification of console in any way that could allow it to be used to play unlicensed software."
(Not the actual term)
There's probably also a set of click through terms (click wrap) when you first turn on the system too.
Separately, ssj12 you are confusing visual and aesthetic modifications with mod-chips which modify the Xbox 360's ability to read and execute unlicensed discs and files.
I would cite regulation, but I know you will simply ignore it.







