How about Grammarly? Or G-suite? They have access to most of the companies out there. I find it terrifying people use Grammarly and it has access to every piece of confidential word written.
I'd suggest companies look into LanguageTool's "On-Premise" commercial offering or run the Java-based server themselves (with N-Grams). Is it as good as Grammarly? Nope, but it is "90%" as good and significantly more private.
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0: https://workspace.google.com/learn-more/security/security-wh...
1: https://workspace.google.com/learn-more/security/security-wh...