No mystery. They're cheaper, they don't come with Musk's politics, nor his dumb decisions (no rain sensor, no stalks etc.).
Sorry, but that's just short sighted. Did you actually sit in a Chinese car, or at least seen any with your own eyes? I can tell you that ZEEKR, Changan, Exeed, Li Auto, BYD, Jac and others are well known and well respected in certain markets. In our harsh and cold climate, Chinese brands don't seem to be any less reliable than the Japanese, Korean and European brands that were historically used here.
For better or worse; that is the current perception.
Still I think people would prefer Western made electric cars if they were competitive with Chinese ones.