In order for an agency (offline or online) to book anything on the Winding Tree platform they will have to send a certain amount of Líf to the seller. The miner fees are also paid in Líf.
Because Winding tree is open-source, anyone can propose a change to the platform code, perhaps in order to update a smart contract with some new business logic. But because the marketplace is decentralized, its participants have to approve that change.