Why? Silicon Valley is in California where noncompetes are illegal. Silicon Valley companies don't use them. I've been in Silicon Valley my entire career and I have never seen one or heard of anyone who has.
Who? Nobody with that username has posted anywhere in this entire thread as far as I can tell.
Everything that follows this is a subsequent edit.
edit: I'm adding this bit for further explanation.
I was being criticised rather heavily for responding to what was written as it didn't look "Charitable" in the light of subsequent expansion. It's right there still if you care to look.
edit: this conversation thread has been completely de-railed by it. Was that the point? Who knows...
I don't plan to start adding those kinds of remarks when I edit a comment. I don't care if other people do this, I just don't see any value in it myself, and I'm just as happy if people simply edit their comments without calling special attention to the edit. I'm not following the history of their comment, I'm just reading it at the moment I read it.
Of course if people have replied to a comment, and a subsequent edit changes the meaning of the comment so the replies don't make sense any more, that is a different story and deserves an "edit" remark.
I hope we can remain friends, OK?