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youtube is much more simple to use for those who have not already registrated them self on Dtube.

Everyone can open a youtube video and watch it.
But if you want to watch a dtube video, you must log in with a username and password first.. ;)
And if i am not exremely interested in seeing a video, i will just skip it when they ask me to log in with username and password to see it.

Therefore i think youtube is much better and more user-friendly. :)

Well that is true. But considering that dtube.video uses the same credentials as steemit.com, i think there should not be any problem. No?

If i wanted as many as possible to see my youtube videos, then i would use youtube and not dtube.
Most of those who use youtube use it for more then steemit.