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They have arguably the most diverse userbase of any company, with users from pretty much every single country + language across all their services & apps. I could easily imagine a handful of use cases having a high performing universal translation model would be incredibly useful.

Ads and Reels (their TikTok competitor) I imagine would be the primary use-case. Imagine spreading the "wonders" of TikTok-like videos to non-$native_language speaking world.

but isn't that a TikTok shtick to use the obviously fake voice in your video?

The metaverse will not have any language barriers...

Ads in any language!