Lady Lee, I had the same problems thinking of the WT as a cult for a while. It wasn't till I realized that the control doesn't have to be physical (as in a commune) that it became clear. In many ways I think the mental bondage is way more powerful.
However, it is probably worth restating that WT does have something similar to communes as well. The Bethel's and branch offices, with members taking vows of poverty, and their inability to make their own money coupled with the tiny allowance they get functions similarly. One difference is the fact that Bethelites can get "green handshakes" and money from family if they have it that way.
So in the end it comes down to the mental control which to me is analogous to the commune which clinches them in my mind as a cult.