There is only one side to this particular 'coin'....and that is BoXXi's side.
The situation wher a site 'hosts' your work without permission means that they have STOLEN your copyright.
You and you alone determine who copies what and where.  You retain [or are supposed to retain] all rights as to how your work is distributed and/or disseminated publicly....and 'should' have full and final say if and when you wish to alter or vary those rights and controls.....such as passing rights to an agent or site for display [such as is the case at Wincustomize.com].
If you have not consented to your works being displayed somewhere it is an added effrontery to have to attempt to contact the wrong-doer to correct the situation, yet that is the case with situations such as this.
Think.
This site could just as easily be a warez and/or kiddie porn site where your 'works' are merely an adjunct.....my guess is you won't feel quite so magnanimous....yet who is to know ....since your name is listed...perhaps you endorse the other 'product' on display.
Why does Wincustomize.com make such a fuss over being 'a family site'?  Because it means no-one will be uncomfortable to have his/her works hosted here.
Why does the uploader have a 'delete' button for his works?  Because they are his...and his alone to control.
This is all about Artist's Copyright....and ensuring the artist is afforded the respect he and his work deserves.
Do not be fooled by the 'oh but they list our names'.....they didn't ask to list your names EITHER.
Doubly damned....