I’m actually surprised that it lasted as long as it did.
I see that it is on Turner Classic Movies quite regularly, how long before it disappears from there as well. TCM used to even run Birth of a Nation a couple of times a year, but I haven’t seen it on there for a few years now.
Ted Turner loved GWTW so much he bought the rights to the entire MGM back catalog just to get GWTW. That is why TCM is MGM heavy in its content. Birth of a Nation as far as I know has long been in the publlc domain.