Further to Michelle's (accurate) point, those programs aren't great. MS Editor sometimes introduces errors, and supposedly Grammarly does too.

To be fair, I have had clients submit practically unintelligible texts to me. This made the editing process extremely slow and expensive, so when I got complaints about how long it was taking, I encouraged them to use Grammarly before sending the work to me. Grammarly helped them see what was unclear, fixed some simple stuff, but was unable to rephrase the unintelligible bits on their behalf. It shaved maybe 30% off the time required — but the time required was still at least DOUBLE what I would normally have to put in for a genuinely well-written work.

The main issue is that machines don't actually understand humans. So when a human is not making sense, the machine can't figure out how to proceed, and it certainly can't help. It's like the writing-industry version of a useless customer service chatbot, lol.