The KCNA certification course is not a paid program. It is a free training program delivered by Andela, the CNCF, and the Linux Foundation. However, if you are taking the CKAD certification course, you will be required to pay a discounted exam fee of US $285 (discounted from US $445) to obtain the CKAD certification. You can learn more about how this works here.
The skills learned on the Kubernetes path are in demand and the program can be a valuable addition to your resume. You can check out more perks of joining the Kubernetes program here.