Re: but that's the same as everyone elses review!
So you’ve come up with £70 and you don’t have half of the parts. I’m assuming that you’ve never been charged with creating a BOM for production? You seem to have forgotten it has a screen, buttons, a charging circuit, custom PCB for this stuff to be soldered to, audio circuit, speaker, probably screws, packaging, manufacturing costs etc. Additionally a 3D printed case will be a sight worse than this as anyone who has ever used one will attest.
Not that I’m defending the poor results here, but an armchair expert’s uninformed opinions of how stuff is made usually has little in common with reality.