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 🤷
Probably does some. I just suggested it because it’s what he already uses. I’m not sure if it does everything you type or only when you use the built in google and gif search stuff. 
 iOS keyboard probably does the same too. 🤷🏻‍♂️ 
 Closed source, so can’t verify, but they allege typing models are on device, and yeah, they definitely have some form of phone home for gifs (apple calls it #images). 

There is a nice giphy plugin too which I use more often. I would never lie to someone and allege the iPhone was safe for someone with a high threat profile though.