I'm not entirely sure there's any large and complex C/C++ application which would be considered 'clean' by any generally accepted standard.
And in any case, i'm not sure that requiring anyone who wants to put up their own webpage to know how to write an OS level application necessarily leads to a web with freer expression than exists now.
And in any case, i'm not sure that requiring anyone who wants to put up their own webpage to know how to write an OS level application necessarily leads to a web with freer expression than exists now.