Never let your audience guess what you are trying to say, your writing should literally speak for itself. When your content has too many errors, it becomes difficult to read and understand. Although, one or two errors can be skipped by readers, but glaring grammatical errors can minimize the impact of your content. Also, it can make your writing difficult to read and digest.
Would you ask somebody who does not talk great English and has no capabilities or experience to revamp site content? No? All things considered, this is precisely what many individuals do when they go to some modest administrations or specifically procure the least expensive specialists that they can discover, The final product is regularly add up to refuse that has unmistakably been composed by somebody that does not see either the subject or the dialect. Far more detestable it will regularly fall flat a literary theft checker which will cause you real issues with the web search tools.
Imo it is not possible for google to detect properly spun content, it is not worth computing power it requires. They can do this using ngrams for example, but it is uses a lot of queries. And for example article spinner I coded beats this algo, so google cant detect that the content is spun. Manual spinning is also good but it takes more than 30 minutes per article.