:Hi Graham 
 :No, every editor can edit articles and that includes removing links. I'd recommend leaving an edit summary explaining why you're removing it - I tend to leave something like: 
 ::removing per [[WP:EL]] - inappropriate external link 
 :...which is then displayed as: 
 ::removing per WP:EL - inappropriate external link 
 :That allows readers to click on the link to the relevant policy so they know exactly why the link was removed. 
 :Although there are administrators, there aren't moderators as such.  Everyone is free to add and remove text. Many people who add external links will be unaware of the policies involved, but some of the time other editors who are aware of the policies will catch the edit and remove the link. 
 :If an employee of Sun was to add a link to a Sun product that would be a conflict of interest - in general, editing articles with which you are involved is a bad idea (though not necessarily prohibited in all cases). You might see on articles' talk pages something like "Hi, I work for Sun and I'd like the following external link added: http://www.sun.com/example. Is that OK?"  That's the good way to go about it: it enables editors without a conflict of interest to decide. 
 :Hope that helps. 
 :Cheers,