>Yes, it really is called ASS. Its predecessor, SubStation Alpha, went by SSA, and since these formats were developed by enthusiast hobbyists, I believe they couldn’t resist the siren song of a little bit of cheeky naming.
The good/old subtitles in the ASS format required a more complex playback system than what Netflix/Hulu (and maybe blueray players) currently offer. This could be worked around by burning the subs into the video stream, but then you need to keep separate copies of your (large) video files for each subtitled language.
That doesn't seem like it'd be such a huge problem to me, but what do I know?
The post does a good job explaining the effective monopoly system at play that prevents real competition to provide any pressure to improve or maintain the prior quality.
Assuming each video in its largest bitrate is... 2gb for example, and assuming S3 is $0.025/gb, that's a nickle per month or let's say $0.50/yr for that video.
Next up is reduced bitrates, assume you go from 2gb to 1gb and finally 500mb. Round up and you're at $1/video.
Now duplicate it to AV1 and MP4, and multiply that by English, French, and Spanish (oh, and let's say Japanese and Chinese too for good measure).
So a single 2gb video goes from $1/yr to $10/yr, and you're not doing "the dumb simple thing" for subtitles which would basically 4x your cost over "commodity subtitling services".
Or "simplify, simplify simplify", you reduce costs (cha-ching!), and become compatible for syndication or redistribution (cha-ching!)
... and they would have gotten away with it too if it weren't for those meddling kids!
You don't need to multiply anything here, except the number of sub streams. One is ass, the other the primitive standards Netflix and other surges use.
Edit: and to the peer comment regarding S3 vs self host: regardless of 10x cloud cost, it's still 10x volume. Where 1TB local would do, now you need 10TB (10x the cost).