Original sentence: Grammarly is a writing-enhancement platform developed by Grammarly, Inc.Grammarly's proofreading and plagiarism-detection capabilities check for a writer's adherence to more than 250 grammar rules
Edited sentence: Grammarly is sold as a writing-enhancement platform developed by Grammarly, Inc.Grammarly's proofreading and plagiarism-detection capabilities check for a writer's adherence to more than 250 grammar 'rules', although many of these are not grammar rules but style advice, and many of those bits of advice are disputed by writers, editors, and other professionals.Widespread -- do a web search, or start here with a recent test: