I think you guys should be clear what you mean by cross seeding..
Like stated - if the torrents have the same hash, and you are just adding the tracker of site B to the existing torrent from site A, you will get banned on both sites.. because what you are seeding to peers on site A for example, will get announced to the tracker on both Site A and B and vice versa. You put yourself in a position where you could be getting upload credit when there aren't even peers on one of the sites.
If you have separate hash for each torrent though, then that is alright and should be nothing to do with the site (none of their business what you are seeding elsewhere unless you are sharing something that is exclusive).
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