Earlier quoted context omitted.
> More viewers is more better. Captions are a really easy way to achieve that. In a world where perfectly accurate captions are zero-cost and zero-effort, absolutely. That is not this world.
It really shouldn't be beyond anyone's capabilities, though. In its simplest form all you need is a plain .txt file with the spoken words. Major services like YouTube can take that file and align it to the timing of the video, automatically. Almost all the hard work is done for you. Obviously all content is different, but for the benefit you get, it's hard to understand how any creator of any size at all does anythin…
It seems to me if it's the responsibility of people who can't understand the video to deal with that themselves (learn the language, hire a translator, etc...). Why is that different if your language is sign language or something else?