Definitely those topics are discussing about redistribution, but not about licensing.
Is Btsync license under Bittorent's? (http://www.bittorrent.com/legal/terms-of-use)
If so, It seems Btsync also prohibit the use of commercial purpose. Is there any way to use it for commercial purpose?
-edit
I found (http://www.bittorrent.com/legal/terms-syncapi) sorry!