They have a premium and a free account with the premium account allowing you to do advance grammar corrections plus vocabulary suggestions to help make your writing better. (adventureinyou.com)
One Republican source told the Washington Post that the only changes were «two edits requested by the FBI and by the minority» and some other minor things, like grammar corrections. (vox.com)
As things stand... you're effectually saying that all these folks suggesting grammar corrections = self - publishers, who don't know quality — but that means self - publishers are the only ones who know or care enough about correct grammar to comment, which means that self - publishers are the ones who know correct grammar. (goodereader.com)