"I consider PPRuNe private property (though I don't know the owner) so while here, I'm either a guest under conditions, or a trespasser"
Pilot DAR.
P-DAR, while I don't disagree with your broader sentiments, the website may well be privately owned (like many non listed companies), and may even be able to choose its customers (users) and source of advertising revenue, but it is very, very firmly in the public domain and likely to be viewed as such from a legal perspective, much like a newspaper for example.
Which probably explains BRL's caution on libel issues.