Sounds so odd, right? I use it to apply fixes for transcription of YouTube videos. There, YouTube uses lower case for things without commas, caps, and periods. I use another tool called https://pinetools.com/remove-line-breaks to add those things. Overall, it provides a good output. I do have to monitor so that it doesn't mess some things. Some use cases have tighter deadlines, relatively easier and non-serious suggestions.

Regarding learning from mistakes, I vote that Grammarly definitely teaches us to write better.