Hey,
I can’t disclosure all my use cases, but I would say that I literally use it for EVERYTHING.
Strapi, for me, is like a swiss knife.
I use it for Data management, automation, APIs, Integrations between third-party APIs and my apps. It really helps me code faster since I don’t have to write all the staff from zero. I already have many plugins/preconfigured templates that I can reuse in any new app.