1. Not shipping fast enough. This one is standard startup advice. 2. No traction for the amount of time we worked on it. Probably caused by not shipping fast enough and not talking to users properly. 3. No conviction. I didn't really care enough about the problem to go all in. TBH, I just wanted something to work on to put on the resume. 4. No competitive advantage. There are a tonne of personalised news apps out there. We had no differentiating factor. 5. No realistic plan to monetise. 6. Finally too many co-founder disagreements as a result of everything so we called it quits.
I don't regret the experience because it taught me a lot about what not to do in my current project.