For example, I cannot place crafts-related topics when this community is about finance or sports.

One of the features I love in hive... So organized.. I once posted in the wrong Community and I was warned and got no vote. Can these be done on blurt too.. so many post here without direction, here you can find any content anywhere, not so organized. Here we use tags because it's popular even if it's not in relation to the content. I have seen some users using some of the whale names, as tags just to get seen.. hmmmm... Communities is needed in blurt. Is taking forever.....