Now I think I got it. I watched a vlog of @exyle where he told that several dapps were relying on full nodes provided by Steemit Inc. and that was the reason why there is/was reliance on Steemit. However, Steemit Inc. just released an update where they managed to cut the RAM requirement to run a full node from four hundred something gigs down to 61 gigs, so that probably will help decentralization and reduce dependence on Steemit Inc.