Yeah, to be clear, I'm not suggesting that anyone copy other apps and pass them off as their own, or even include them in their portfolio. This isn't copywork

Yeah, to be clear, I'm not suggesting that anyone copy other apps and pass them off as their own, or even include them in their portfolio. This isn't copywork in the sense of "I don't know how to design so I'll copy Twitter's design"... it's more like, "I don't know what kind of apps to build to get better, so I'll copy an existing one for practice."