Qlik Cloud Services now can be used as part of your infrastrcture in multi-cloud scenario.
In this scenario currently you must use Windows-based Qlik Sense site to create apps and for user/apps administration. Qlik Cloud Services in this scenario can be used currently as part for elastic scaling only. So you can publish your existing apps in Qlik Cloud Services to provide capability of massive consumption of your apps without increasing number of your servers and complexity of your existing Windows-based Qlik Sense site.
In future functionality of Qlik Cloud Services subscription will be expanded in accordance to Qlik Sense Roadmap. Expect a beatiful news on this in near future.
Qlik Sense Cloud Service - is the service provided by Qlik. So customers may use this service as "ready to use" solution, without technical understanding to "how it works" and "how-to deploy, administer and support the service". As alternative to Qlik Sense Cloud Service, you can create your private infrastructure based on Docker/Kubernetes (private cloud) or may rent such Docker/Kubernetes infrastructure on any public infrastructure cloud provider (for example, AWS, Azure, etc.). Then you can deploy "Qlik Sense for Elastic" on this infrastructure and use it for massive consumption of your apps.
So currently you have several alternate variants to create infrastructure: - Qlik Sense Enterprise (Windows-based) + Qlik Sense Cloud Service; - Qlik Sense Enterprise (Windows-based) + Qlik Sense for Elastic (Docker/Kubernetes-based); - Qlik Sense Enterprise (Windows-based) + Qlik Sense Cloud Service + Qlik Sense for Elastic (Docker/Kubernetes-based).
You will also receive even more flexibility in near future based on Qlik Sense roadmap. Stay tuned.