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You're going to have to explain. L2 heavily rely on the Ethereum base layer.

Most L2s will require users to pay transaction fees in ETH. Some will have fee abstraction where people can pay with tokens, but the rollup themselves will still end up paying ETH on L1.

Ethereum will essentially be a settlement layer for rollups, and everyone will be doing their DeFi, NFTs, etc on the rollups which are almost treated like their own chains.

Their proof ends up on L1 and they get cheaper the more people use them.