This happens not only on Facebook, but on every socially properly working platform.
This is not different at all.
None of them are different in this aspect.
Hive needs people, who not simply engage in a topic, but people, who have actual, real, genuine, mutual interest in at least one topic.
If the above mentioned thing is given, then the interaction/engagement will naturally come with it.
So the people will naturally use the platform.
This is the base concept of a socially properly working platform.
And Facebook is only one of these platforms.
I know :)