I have used it a few times to gauge US news.
Their FAQ says
Where does the news on Ground come from?
The news on Ground comes from 2 sources: directly from over 50,000 major news publications (newspapers, news TV channels, news magazines) from around the world, and trending social media (including select blogs). If you don’t like the mainstream perspective, you can always find the independent one by swiping through sources or by following your favourite publications.
If you look for alternatives and want an even wider view you could have a look at the GDELT Project:
GDELT monitors the world's news media from nearly every corner of every country
in print, broadcast, and web formats, in over 100 languages,
every moment of every day.
It compares stories by the relative coverage in the left/right leaning media.
Some stories are 100% covered by just one political orientation, while others are a mixture.
It's an interesting way of seeing what each side is completely ignoring.
I cam across this aggregator site and like the concept but not completely sure to what extent I should trust its truth ratings.
Has anyone else used it as a new source?
https://www.ground.news/