Trades routed through external liquidity sources pay Uniswap protocol fees that contribute to burning native UNI tokens

From the articleUniswap Launches Aggregator Hooks on Ethereum, Base and Robinhood ChainAlso in DeFi Giant Uniswap Taps 7 Rival Liquidity Sources to Burn UNI Tokens, Uniswap Turns v4 Into an Aggregator, Sending Fees From Outside Liquidity to UNI Burn - Unchained, Uniswap's aggregator hooks go live on Ethereum, Base and Robinhood Chain, Uniswap adds seven trading sources as 0x disputes its protection from malicious hooks, Uniswap v4 Is Now an Aggregator