hrm.. as my online gets very intense in many aspects.. I think this would have to be false. There is danger in online -- mental and emotional danger is just as valid. Words and thoughts can trigger much. I think the online safeword is necessary and I have pushed past online subs far enough to have to use them. It's not a negative thing for them to do so as I see it's part of what I'm to do .. to get them to push to new level or limits..
The Dom who doesn't stop ... well ... IMO .. others will eventually rethink what that person is.