Lightning Network unfortunately depended on transaction malleability being fixed. This was, I believe, fixed by segwit. So it's only been a possibility since Au

Lightning Network unfortunately depended on transaction malleability being fixed. This was, I believe, fixed by segwit. So it's only been a possibility since August - and the Lightning Network Daemon has been under heavy development. It can now run on the Bitcoin network itself, but is not yet in a state where it works "automagically", nor would many people depend on the code being relatively bug-free yet.