What Netflix supports on their main website might not be what they care about, though; you used to be able to watch Netflix on the Nintendo Wii, and they probably still have some users on stupidly old smart TVs.

Also fun fact - subtitles did not work on the Wii at all if you were running a video streaming service!

The BBC spent literally years trying to engineering something that did not result in it being unable to playback video smoothly and failed.

Fast forward to 2025 and BBC's streaming app on ApppleTV only just added subtitles; vastly more powerful hardware but so many restrictions from Apple on how developers use it.