Hi @resti.hariyati.
The sentence you highlighted applies to Katalon Studio and TestOps which offer free and paid versions (you can use either the free and paid version of these solutions for certifications).
Katalon TestCloud, on the other hand, is a paid solution. It offers a trial period with limited executions for users to use. To use it after the trial period ends, you need a license. That said, with the Katalon Community’s Kudos Reward Scheme, you can earn 3-month usage of TestCloud. More information here.
Hope my information helps you.