Money... they want the Chinese to consume NBA content, merchandise and possibly extend the league.
So much for NBA.
(I mean, I guess it ain't unprecedented, given that there are Canadian teams in the NBA, but at least Canada and the US are close geographically and culturally, while China is neither, last I checked)
https://en.m.wikipedia.org/wiki/National_Hockey_League
In retrospect it makes a lot of sense; but I guess in my subconsciously Americentrist way the thought never occurred to me.