Chia pre-mined 6 years worth of block rewards. Proof-of-space may be the closest thing we have to a viable proof-of-work replacement but this instantiation of it feels like a get rich quick scheme for its founders.
Edit: My calculation was based on the initial reward schedule of 64 units per block, but when you take into account the fact that it ramps down to 4 units per block shortly thereafter, it's actually a premine of 21 years: https://www.coindesk.com/5-takeaways-from-chia-networks-new-...
Edit: My calculation was based on the initial reward schedule of 64 units per block, but when you take into account the fact that it ramps down to 4 units per block shortly thereafter, it's actually a premine of 21 years: https://www.coindesk.com/5-takeaways-from-chia-networks-new-...