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.
Grammarly should absolutely be banned. Their privacy policy is horrible.
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.
G-Suite is a super interesting case in that you literally cannot use the product without handing over your data to Google. It certainly seems like companies would hate that, particularly those with data protection obligations. Google does theoretically require a Business Associate Agreement (BAA) if your use case is subject to HIPAA and you intend to store or transmit PHI using their services, but I don't know how they detect or enforce that. [1]
Since when does complying with data protection mean "you must own your entire tech stack and run it on prem"? Google[0] states that they don't use your data for anything more than running the service, and there are multiple pages detailing how they secure data on their servers from both employees[1] and attackers[the rest of the document].
