@murleli
Liquidity pools are a multifaceted tool that benefits all participants in decentralized swap. Yes, liquidity pools are primarily sources of tokens for swap, but on the other side of this process there are liquidity providers, and they supply liquidity for a reason.
A small part of the swap volume is shared between liquidity providers, but if the volume of swaps is large, this share can provide a good APR. For example on the $TON blockchain the main DEX is STON.fi, and active liquidity pools provide the following APR:
$PX/TON, APR: 66.05%
$FPIBANK/TON, APR: 108%
$HMSTR/TON, APR: 3.54%