As much as I like the Haka I think we tend to take a liberty with it. Other countries get to sing just their National Anthem. We get to sing our National anthem twice (Maori and then English versions) and then on top of that a Haka.
I could be argued that there is some sort of psychological advantage to that, and, is a war dance really appropriate anyway? Yes rugby is physical but it is not gladiatorial.
Oh and if you want a good legal stream, and you have an android device, then try Mobdro.
https://mobdro.how/download-mobdro/Search for ITV. It is compatible with Chromecast.
It only dropped out once and reloaded straight away.