Earlier quoted context omitted.
Two big problems. One, AI mediation of language sees issues like bias amplification (AI learns our biases then suggests them back to us). Google itself wrote about this recently [1]. Two, spell check has a homogenizing effect on spelling [2]. If you extend this to the level of phrases, that will homogenize not just spelling but the very way we talk. [1] https://developers.googleblog.com/2018/04/text-embedding-mod...…
To add a third, I have a problem with my personal emails being used as a corpus of text to train these models. Maybe they're using only my emails to train a model for me, and turning that feature off disables them doing so. Maybe they're using everyone's email to train a generic model. Of course, they've been (machine) reading your emails to provide ads since forever, so in that sense maybe this isn't really that new…
We've stopped using emails for Ad targeting entirely, and the enforcement is quite strict, as reported in June: https://www.nytimes.com/2017/06/23/technology/gmail-ads.html