I would also expect that the Deepseek devs are using MacBook. If not they may be using Linux - Windows is possible of course but not likely imho. I have no knowledge about that area though so would be interesting to here any primary sources or anecdotes.
Deepseek is in Hangzhou, so I guess they are. GDP/capita in Zhejiang is pretty high, even more so for HZ. If you ever visit, it feels like a pretty nice place (especially if you can get a villa around xihu). I also visited ZJU once, and it was pretty Macbooky, but I don't have as much experience there as Beijing's Zhongguancun.
