The problem you’re describing is different than the one Lemmy solves. Lemmy is just a federated, open source alternative to Reddit. It doesn’t try to be anything else.
But the good news is this: If somebody wants to create “a social media site with politics discussion that is moderated without bias”, they can just use Lemmy and make it happen. They no longer need to create a 50 person company to develop the software the runs the network. It can be done by a handful of people now, and that wasn’t possible before.