link to the “Grammarly” thread:
https://www.facebook.com/groups/onlinelearningcollective/permalink/717390118891689/

Hi all, I don’t use Grammarly, but I hear that a lot of people find it useful. I am also hearing that some instructors/universities find its use problematic. Several years ago, a student that I knew was not a good writer was accused of plagiarism by another instructor. She claimed that her nearly flawless papers were written with the help of Grammarly. I am curious to know if you encourage or prohibit Grammarly in your classes and if your department or university has a policy concerning its use.

My summation of this thread:
naturally, opinions are for and against:
pros –
it helps/forces students understand the need to proofread
partially replaces the very initial work of instructor
cons –
algorithms/technology are/is not perfect
it does not replace a living person (sic!!!)
e.g. it detect passive voice, but does not teach the replacement

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more on grammarly in this IMS blog
https://blog.stcloudstate.edu/ims?s=grammarly