Libre is the first and only blockchain to feature an on-chain referral program. When you refer someone to Libre, and they stake and earn a staking reward, you get 10% of that reward.
If you are technical, you can run a validator node on the Libre network. Validators are paid for each block they produce.
Bitcoin Libre uses the concept of Libre Lightning Providers, which are nodes that pay Lightning Invoices in exchange for pegged Bitcoin. You can earn transaction fees by becoming an LLP.
The Libre blockchain subsidizes play to earn games such as the "Bitcoin Libre Spin" and "Crypto Wordle" by Machine Candy. Free to play and earn.