I think the "laundering" charge works both ways. While it is true that it will help some leverage work that went into GPL projects for new non-GPL projects, it

I think the "laundering" charge works both ways. While it is true that it will help some leverage work that went into GPL projects for new non-GPL projects, it is more important to know that it provides cover from accidentally importing copyrighted material from Microsoft, et al, into GPL projects. While the value of the trade might not be fair, the cost that legions of corporate "Intellectual Property" lawyers can force upon the lone open source developer are a far larger drag on development.