(1) It would be useful in the context of a general style guide, like a white-label Grammarly. Corporations could set their own prompts for words, phrases, and structures. This would make documentation more consistent.
(2) This is dystopian as fuck. Google has the ability to see, aggregate, and now influence what you write in Google docs and Gmail. Who is making the decision on what to "correct"? Is this algorithm explainable?
Bias: I already disagree with Grammarly as an entire category of product.