Another good step from Elrond team

ZeroSwap will integrate with the Elrond blockchain. ZeroSwap is a multi-chain protocol that aggregates DEX liquidity and enables zero-fee transactions for DeFi products such as liquidity pools, while rewarding its users.
https://elrond.com/blog/zero-fee-defi-on-elrond-zeroswap/This "zero-fees TXs" feature sounds pretty awesome, on paper, at least. But I wonder how the Elrond blockchain will make this happen, and avoid spam transactions at the same time. I saw this 0 feature on other projects, is not a first, but those chains are DAGs.