(Haven't used Ground News but have seen some adverts for it)
I like the concept Ground News claims to be going for, which is just listing all the different media outlets reporting on a story so that the reader can do what they will with the additional context. I'm not as OK with media bias fact check, and if Ground News is trying to integrate it in some way on their service, I don't think that's good either. the whole point of Ground News seemed to me to be trying to explicitly NOT tell the reader what to think about a given article, and MBFC would undermine that IMO