No. It’s completely free to hire as many subcontractors or wokers as you like!
We rely on an honesty system of job posters telling us who they have hired as we charge the subcontractor or worker who wins the job a Winners Fee. The Winners Fee they are charged is a 5% commission of the contract size advertised, and it's charged to them 21 days after they start the work. It is also free for them to apply or submit final bids.