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No need to be aggressive, as I am not being cynical. I am genuinely asking, because I couldn't see any immediate need for it in their main product.

But also remember that accessibility for visually impaired folk is often. A regulatory imperative in those product lines.

Facebook has its own Alexa/Echo like offering. Not sure if Messenger also has voice functionality.

It does, you can do video and voice calling from the Messenger app