[vlmutolo]

There are lots of different things you can do with Spaces. But yes, you can build your own Space out of arbitrary rooms you don't own without anyone's permission.

Then there are what you might call "canonical" spaces, where space A labels space B as its child, and B labels A as its parent. Then you know that the relationship between the two is mutual, and clients can take that into account.

But you're free to create your own Spaces that are the parents of other rooms, where those rooms/spaces are unaware of the Space you created.