Personally I think if you are genuinely submitting online - whats the difference?
I think there are people in the online world who sit at there computers and pay lip service to their submission, assuring their Doms?Dommes that they are carrying out their tasks, doing what they are told and so on.
I think this is why so many people Doms/Dommes in particular like their subs to have a webcam and a mic or a cam or a mic. Not that it is impossible to fake cumming on a mic or a cam.
I suspect it is the fakes that give the online issue its bad name. Why people would enter an online relationship when they have no intention of doing as they are directed by their Sir/Maam is beyond me anyway. Although I'm sure the psychologists out there could tell us.
The short answer to your question Talia is no not at all. Your submission online is just as valid as real life.