If you not opt-in, you will receive your tokens to your address when your earnings will clear the minimum threshold for L1 transaction (accumulated earnings should be in 4 times greater than fee to transfer it on L1).
If you opt-in for zkSync, you will receive tokens on your address on zkSync independently of minimum threshold on L1.
To move your tokens L1->L1 (Ethereum), you need to pay fee to miners in ETH.
To move your tokens L2->L2 (zkSync) you need to pay fee in STORJ tokens (it’s much lower than transfer fee on L1)
To withdraw your tokens from L2 to L1 you need to pay fee in STORJ tokens, the fee almost the same as L1->L1 transfer: