First of all, as I have already stated before it is incorrect. The use of comma at least should be properly understood and it is not.
The main reason however for this review is the potential for huge security and privacy issues. Especially if you use it for a company. I work in the security domain and I found no way to allow my colleagues to use Grammarly and keep my company's assets secure. Be absolutely sure that you know what they get from your computer before you use this!