Amazing how low tech the US is ...
I recall being gobsmacked, years ago - 1990 -, on my first US visit to watch some "tomorrows's world" programme where the presenters were creaming themselves over the fact that US scientists had found a way to encode data into the 4 unused scan lines in a TV picture, and that they were suggesting this could be used (with compatible TVs) to transmit, news and weather.
It finally dawned on me that that had just invented Ceefax ....