Is there an industry, any industry, that does not aim to "improve lives" (even if they do not state it explicitly)?
edit: Just to extend this thought, I see statements about "improving lives" as laziness or lack of clarity about the value they bring to users. If all you can say about your note-taking app is that it "improves lives", you need to dig deeper to explain how it improves things.
I think there are some, like top athletes that want to break records. They are extremely competitive but they don't pretend to be improving lives. Some of them do use the attention they receive to improve lives.
edit: Just to extend this thought, I see statements about "improving lives" as laziness or lack of clarity about the value they bring to users. If all you can say about your note-taking app is that it "improves lives", you need to dig deeper to explain how it improves things.