You haven't done your research, because ETH did not abandon PoS, and permission-less distributed databases have existed since the 70s and failed then for the sa

You haven't done your research, because ETH did not abandon PoS, and permission-less distributed databases have existed since the 70s and failed then for the same reason all these will fail now - you simply cannot scale and keep it distributed, it all ends up getting centralized to a few key points because of the cost to maintain the exponentially-growing distributed infrastructure.