Rollup is one promising solution to the Etheruem scaling problem. There are three good candidates.

Besides Optimism, Arbitrum and zkSync are two rollup projects that show good signs of growth and adaption. According to airdrops.io, users can interact with the ecosystem and potentially receive airdrops.

Arbitrum

1. Visit the Arbitrum bridge page.

2. Connect wallet and transfer from Layer 1 to Layer 2

3. Try to make transactions on dApps supported by Arbitrum.

4. You can also combine the Across speculative airdrop or Orbiter Finance speculative airdrop.

zkSync

1. Visit the zkSync mainnet.

2. Connect Ethereum wallet and swap on the platform.

3. You can also use Ramp to fund your L2 Zksync mainnet wallet directly.

4. Visit the zkSync testnet page.

5. Get some Goerli test ETH.

6. Now use the Deposit, Transfer and Withdraw options. Also click on “Faucet” to get some testnet tokens.

7. Use zkSync based dapps like ZigZag to increase your chance of getting a potential airdrop.

8. You can also combine the Orbiter Finance speculative airdrop.

Other possible airdrops:

@Orbiter_Finance, @ZigZagExchange, @argentHQ, @phantom, @friktion_labs, @Katana_HQ, @JupiterExchange, @AtrixProtocol, @symmetry_fi, @TwisterCash, @PikaProtocol, @Clipper_DEX, @cozyfinance, @DeFiSaver, @CharmFinance, @aztecnetwork, @gnosisSafe, @PolynomialFi, @zapper_fi, @zerion_io, @ShellProtocol, @FujiFinance, @MetaMask, @friktion_labs, @gemxyz, @geniexyz, @Slingshot, @lifiprotocol, @unagiidotcom, @SablierHQ, @opyn_