Before the London fork, pools could set the gas cost at 1 gwei for payouts and mine to their own blocks to be able to offer free payouts. The new fee structure now requires a minimum base fee, which is set by the ETH protocol for every transaction. This no longer makes free payouts feasible.

The Matic network payouts use MATIC for gas feed and are possible if you use a wallet where you have the keys. The payout address is the same for both chains and you just need to import the wallet seed phrase in to Metamask to be able to access your coins on Polygon. Keep in mind payouts to Matic are made in WETH. If you want to  bridge back to ETH, you will have to pay a pretty high gas fee to the ETH network.

If you want to keep your payouts on ETH, you can set a lower gas fee limit from the default 40 gwei on Ethermine. I would also set a higher payout limit to keep the gas fees from eating in to your payouts.