Without naming names, there's a well advertised grammar editing tool that's available either as an app download or browser extension. This is something I'd value for a number of reasons (good grammar is important!) but I'm super cautious about anything I'm giving permission to watch what I'm typing.

Ideally, I'd prefer to select text and have it analyzed on-demand using on-device intelligence. I'm on a Mac and it seems like Pages isn't cut out to check grammar. Also, there's no way in heck I'm paying $30 a month for a subscription.