I think, and I've previously spoken with Shiftrox about this, that 'some' light chat about other games is ok, as long as we're not 'abusing' the systems. I believe the campfire has become a 'centre ground' for a lot of Hive users and discussions, so it makes sense for other devs to try to shine some light on their projects here too.
As long as we're also supporting Hive Grove, and not taking anything away from it, Hive is exciting enough to have a little sprinkle of everything :)