The Brizy Cloud account included with your WaaS license is only for you, the owner of the Brizy account. You can use it to do client work and to create landing pages and/or websites for your clients but there are no tools in place to let you offer the Cloud service to your clients.
This is not a white label cloud that can be used as part of your WaaS license to be shared with your clients.
You'll have access to Brizy Cloud as long as your WaaS license will be active.