As said many times before, any 'normal' NSPs also "is making money from copyrighted content that it hasn't licensed", so you statement is true, but irrelevant. Google Groups just has a *different* financing model than (most) 'normal' NSPs, that's all.
You mean like a 'normal' cancel control message? :-(
I don't see what that has got to do with anything and how that would be "on shaky legal ground". It's a good point that you say "Caveat: I am not a lawyer, and this is not legal advice.".
As said before, the poster has already opted-in, so there is no need to offer an opt-out. That they *do* offer an opt out is just good Netizenship, not a requirement. FWIW, there are other archives which do not offer an opt-out. They are just not as big/well-known as Google. Is what Google is doing more (supposedly) 'illegal' just because they are bigger and a nicer target for a law-suit?
I (more or less) agree with that. I just do not agree that they *copy* any more (or less) than 'normal' Usenet/News servers/readers. It seems to me that some people, including you, are using a copyright angle and are trying to prove or at least imply that Google Groups 'illegally'
*copies* stuff, i.e. that they copy stuff which they are not allowed to copy. Well [drum roll], they *don't*.I'm not a lawyer either, but I think I am a better informed layman than you.