Part of the moral deal (to hell with copyright and regulations) when you sign up to a forum is that your posts form integral parts of discussions. To remove them would make a nonsense of threads. If you agree that that shouldn't happen, you should be happy to let your posts stand. If you don't, you shouldn't use that forum. As said, you can always change your username to something unrecognisable, then leave. If someone leaves/gets booted off The Session, their posts remain but their name is replaced by #. On Chiff and Fipple, your posts remain under your name. I wouldn't mind betting that these things could be negotiated. But it ain't right to ask for all your posts to be deleted.