All of the revenue the protocol makes is diverted to LQTY stakers. By staking LQTY you are entitled to a pro-rate share of it.
How does staking work in Liquity?
To start staking all you need to do is deposit your LQTY token to the Liquity staking contract. Once done you will start earning a pro rata share of the borrowing and redemption fees in LUSD and ETH.