I’ve looked at the list and literally all of them are leftist outlets. (Half of them belong to the Gizmodo family.) They are also all US-based.
There’s a clear bias and, honestly, trying to pretend it’s not there is doing a disservice.
Whether that’s because Scroll is not interested in serving right-wing customers or because right-wing outlets are not interested in participating in Scroll, that’s going to remain a mystery I guess.