It definitely adds value to an individual if they are new to the cloud journey. If you are switching your career to cloud or if you are a student and trying to land your first cloud job, cloud certification can make you stand up outside of the crowded applicants.
The second advantage of having a certification is you gain extra credibility during the interview and hiring process.
In no way I am saying a certification can make an individual a better engineer or a developer or an architect, but certification-based learning can give that individual a structured framework to study and be laser-focused on a particular topic.