That's a grey area, but it's something that indeed needs to be decided.
The question about imitating keybinds in chrome sounds ok at first (a lot of people ask for that) but it would probably end up opening a can of worms. Deep down, is it so different from your Sublime example?
If we allow "how to imitate emacs in browser X", why would we forbid "how to imitate emacs in editor Y"?
I guess the former "feels" ok because the vast majority of emacs users also use a browser, while the fraction of us who also use Sublime is much much smaller. Then it becomes a question of: is this first a site about emacs or is it first a site for emacs users?
The first option, a site about emacs, is clean and objective, albeit occasionally harsh. It would involve forbidding such questions.
The second option, a site for users, is very subjective and if we were to choose it, we would need to define where the line is drawn.