I spent a thousand dollars replacing the cheap compressor in my fridge because I asked the repair guy to replace it with better quality than it originally came with, and he used a commercial (as opposed to residential) grade compressor that was three times the price

But aside from a short lifetime, the big problem with cheap AC motors is they’re imprecisely built and often waste more electricity as heat and noise than they put into their output shaft

Of course even with the better stuff there still “cot death” where a new product fails almost immediately (because noone tests their products), but at least those failures are under warranty, the cheap motors typically last at least a few years