The ones without any fees are ones where they are earning more coins by sitting on coins POS or there is no limit to the coins. A zero fee system would never work in the long run. But they are working on the fees issue for bitcoin its just a long slow process since there is no central owner.
The ones without any fees are ones where they are earning more coins by sitting on coins POS or there is no limit to the coins. A zero fee system would never work in the long run. But they are working on the fees issue for bitcoin its just a long slow process since there is no central owner.