Good questions. I don't know.
I have my own streaming radio app that I wrote.
I was listening to news just the other day I was surprised to see a popup with scrolling text.
Huh? I didn't put that in there.
It turns out that it was Android's "Live Caption" which analyzes your audio (locally, they say) and generates captions.
Well, I turned that off!
The settings says that it is currently only available in English.
Yes, I know that this isn't what you were talking about.
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