Nice work those are beautiful flowers. Very colorful.
China's been growing hemp for thousands of years, never stopped like the West did. It's still a huge cash crop, half the world's cannabis is grown in China.
It's not so much it grew into a cannabis superpower, it's always been a cannabis superpower. China, especially the South and West, are hot spots of cannabis genetic diversity. Wild and feral plants with varying amounts of THC and CBD.
I'm not 100% because I can't find the numbers but I'm pretty sure China leads the world in CBD oil sales. Made from their huge hemp crop. They've been marketing CBD worldwide, including in the USA.
They even have a website and a company in Los Angeles that sells the stuff.
Which is why growing a CBD strain is clever. On the one hand China wants to appear hard on cannabis use but on the other cannabis is huge business and everyone wants a piece. It would be hypocritical to harass someone for a small scale personal grow when they're marketing the same plant to their own citizens and the worldwide market.