It Can Be Economically Impractical for the Contract Owner to Claim Airdrop Fees

MerkleAirdropTest.t.sol

    address owner = vm.addr(1);

    ...

    // deploy contracts as an EOA instead of contract
    function setUp() public {
        vm.startPrank(owner);
        token = new AirdropToken();
        airdrop = new MerkleAirdrop(merkleRoot, token);
        token.mint(owner, amountToSend);
        token.transfer(address(airdrop), amountToSend);
        vm.stopPrank();
    }

    ...
    
    function test_GasExeceedsFeeClaimAmount() public {
        uint256 assumedZksyncGasPrice = 0.00000000002 ether; // 0.02 Gwei
        uint256 airdropFee = airdrop.getFee();
        vm.deal(collectorOne, airdropFee);

        vm.startPrank(collectorOne);
        airdrop.claim{ value: airdropFee }(collectorOne, amountToCollect, proof);
        vm.stopPrank();

        // assert the contract and owner have the proper balances
        assertEq(address(airdrop).balance, airdropFee);
        assertEq(owner.balance, 0);

        vm.startPrank(owner);
        uint256 gasBeforeClaim = gasleft();
        airdrop.claimFees();
        uint256 gasAfterClaim = gasleft();
        vm.stopPrank();

        // assert the contract has had its fees claimed by owner
        assertEq(address(airdrop).balance, 0);

        // assert that the amount of gas spent is greater than the fees obtained (in wei)
        uint256 gasDelta = gasBeforeClaim - gasAfterClaim;
        assertGt((gasDelta * assumedZksyncGasPrice), owner.balance);
    }

Run Test

forge test --match-test test_GasExeceedsFeeClaimAmount --gas-report -vvvv

Example Output

Ran 1 test for test/MerkleAirdropTest.t.sol:MerkleAirdropTest
[PASS] test_GasExeceedsFeeClaimAmount() (gas: 129297)
Traces:
  [129297] MerkleAirdropTest::test_GasExeceedsFeeClaimAmount()
    │ ...
    ├─ [0] VM::assertGt(620640000000 [6.206e11], 1000000000 [1e9]) [staticcall]
    │   └─ ← ()
    └─ ← ()

Suite result: ok. 1 passed; 0 failed; 0 skipped; finished in 2.38ms (690.20µs CPU time)
| src/MerkleAirdrop.sol:MerkleAirdrop contract |                 |       |        |       |         |
| -------------------------------------------- | --------------- | ----- | ------ | ----- | ------- |
| Deployment Cost                              | Deployment Size |       |        |       |         |
| 540806                                       | 2502            |       |        |       |         |
| Function Name                                | min             | avg   | median | max   | # calls |
| claim                                        | 59686           | 59686 | 59686  | 59686 | 1       |
| claimFees                                    | 30479           | 30479 | 30479  | 30479 | 1       | <---
| getFee                                       | 225             | 225   | 225    | 225   | 1       |

...

Ran 1 test suite in 5.26ms (2.38ms CPU time): 1 tests passed, 0 failed, 0 skipped (1 total tests)