Not entirely true, although I do not know Dplay myself, I think they still have reputation in the industry. Not because they don't have an announcement thread here, they are already a non-reputable casino. Some casinos are highly reputable even if they are don't have any ann thread here in Bitcointalk. The world is way much bigger outside this forum.
Dplay is connected to freebitco.in so it is a reputable casino, they don't have a thread on this forum but the connection itself is enough to prove its seriousness.
This is the advantage of having an ann thread in the forum. Moderators and staff of a casino like Roobet always monitor their users feedback and act accordingly for the satisfaction of its users as long as it does not breach their contract agreement.
It helps to have an ANN thread but unfortunately there is no active Roobet representative on this forum anymore so I don't think they really follow BCT, which is a pity.