What, did you miss conventional = freeview, sky, virgin bit.
The legislation only covers broadcasts on those services. So if it's not broadcast live on those services it is not classified as TV broadcast.
Twitch, youtube etc are not covered, there's no grey area, It's clearly stated.
So only freeview, Sky and virgin are 'conventional'?
What about BT sport?
How are you coming up with the distinction between 'conventional TV' and other stuff?