When you use grammarly, they put some kind of advert for youtube, so when you watch youtube videos, it will stop and their advert will start. Note, this is not a youtube ad, this is an ad directly from them.
I have been using for over a year on the paid subscription, and have it hooked up to my Microsoft office, and on my iPhone for business emails and texts. I like how it makes recommendations on things I would not think about normally. Highly recommend.
Clear, Effective, and makes me look more professional.
I have been using Grammarly since 2018 & have enjoyed the free version since then. For a somewhat basic to average use, I would recommend Grammarly free tier because it has definitely surprised me with how it works & helps me.