[biztos]

A lot of the cloud stuff can be offloaded to cloud providers. It’s pretty common for apps to let you choose between local storage, iCloud, Dropbox, et al. And for compute, well, the software runs on computers?

If you need more server side action than that, I think you’re selling a service in addition to your app, and then yes, you need subscription revenue.

Often it’s bad idea though, I doubt you’d find many people who prefer Photoshop “cloud” to old-school Photoshop-on-a-Computer.