I want you to stop this diffamation, and retract your unfunded accusations,
First, it was offered as comment. Second, justification for why he regards it as unethical was given. Finally, I don't think there was malice against you personally, or any other developer, as he took pains to point out. I doubt many would consider it defamation, which normally involves malicious presentation of falsehood as fact, as I understand it. Further, I can't find a successful case being made for describing something as "unethical" being defamation. IANAL, though.
I suggest you note your disagreement with his opinion and cease posting to the list about it unless something new develops.
-- MJR/slef My Opinion Only and possibly not of any group I know. Please http://remember.to/edit_messages on lists to be sure I read http://mjr.towers.org.uk/ gopher://g.towers.org.uk/ slef@jabber.at Creative copyleft computing services via http://www.ttllp.co.uk/