When I click Subscribe or Upvote here on Dtube, it copies it over to Steemit, and vice versa.
I think when Dtube tells you you have "no subscribers" what it really means is they are subscribers from Linked Accounts, using a Steeming login rather than a brand new Dtube-only login. If you need Dtube-only logins, let us know.
Also, pressing upvote or sending a comment here on Dtube doesn't seem to work right away. There's a ten or twenty second lag, or have to refresh to see it. Dtube needs a kick up the arse by a decent programmer or a better server setup.
Sov