That’s where tariffs and VAT, and some warranty legislation comes into play

I think it's a numbers game. Sell random popular product X at a huge margin, and you'll get some people that don't shop around that will buy it.

Will you be the next bezos? No. Will you make a living with little effort and little smarts? Probably.

Totally speculating but, the moat must be Chinese speaking employees with enough engineering background at company office. Chinese factories look open to any reasonable businesses so long both are pragmatic and both talks the same language anyhow, but East Asian languages and cultures are related or connected to nothing else so just maintaining good mutual understanding can be hard(and I don't think LLMs help that much).