Jack PM'ed me. And we are looking into that matter.
It's true that many do post free trials for some sites etc..
but usually not starting a thread to actually promote the site. this was Jack's intention and he acknowledges it. His intention was to help and I understand. However our policies are clear and we try to enforce them as often as possible.
I think many abuse the forum and spoil threads. It's a pity in this particular case, since it was not Jack's intention. So again, that's why we are studying what to do for this particular case.
And it's not about free trials or not. A free site is something, a free trial is something else. Almost every service offer a free trial. So if everyone of them would post 'the free trial' saying it's not advertising, I hope you understand can't let this happen. So 'free trial' in itself is no reason to post a link.