An e-list can range in size from a few e-mail addresses for a personal mailing list (say, family and close friends) to one containing tens of thousands of addresses used for commercial e-mails. E-mail trees are going to be somewhere between the extremes.
As far as I'm concerned, anyone whose e-mail address takes up space on my computer is fair game to get an e-mail from me. That's the price you pay for being an e-mail forwarder -- or on the e-list of e-mail forwarders. The solution: either make smarter friends (I wouldn't have your e-mail address if bcc had been used.) or get the ones you have to take you off their e-lists.
Ask me politely, and I'll remove your e-mail address from my e-list. If you demand that it be removed, there's a chance you could end up on a new e-list -- one not all that pleasant to be on.