Only profitable when BYD hasn 't started exporting its way more advanced hybrids.
I'm also curious as to BYD's build quality and longevity of components. Toyota is a known quantity; their vehicles typically run for years with few needs other than routine maintenance.
I've read & watched lots of very positive reviews of BYD hybrids and full electrics based on a few hours' use, or maybe a few days. These cars do look pretty good and are competitively priced in most markets, but they have to be compared apples-to-apples, over multiple years, to get a sense of what it's like to own one.
But with entry-level pricing at less than half of Toyota's least-expensive products, BYD is surely better than halfway "more advanced than Toyota's."
Price point is such an important thing when delivering any product, and if a BYD vehicle lasts even half as long as a Toyota, I'd purchase one.