Basically say you want to make a blockchain, with Ethereums's Virtual Machine (can run solidity smart contracts) but, also with Dash's instant send, and maybe throw in something else. Those are just examples, you don't need permission to bridge to any blockchain although it's recommended. And with PBB you can easily Deploy a blockchain with all of this features instantly. Like smart contracts, we're just now thinking of possibilities, the fact is, they're endless. with smartbridge I could send ark, to a bitcoin address and it will pay in bitcoin. So many different use cases, they vary as much as the imagination. Ark is the only project that has implemented something like this to date.