xcutnr1 - 2006-12-17

In the interest of staying legal, I've done some research.  It seems some softmods are illegal (i.e. Ndure), while others are not (i.e. UDE, UXE).  Also, apparently some older bioses are legal, but it seems all of the newer ones are not.  Is there an easy way of identifying what is and what is not a legal build?  What is the reason that most stuff isn't just built with OpenXDK?  Is it just not that advanced yet?  Too many bugs, or what?  Thanks for any help.