Perhaps Apple is thinking that this is the hard part. Nailing down the most difficult areas of self driving cars will both give them the market in China/India or other areas with similar traffic, and also leaving the "easy stuff" for last, which will only need to be supplemental.
SF is busy, has tourists, and asshole taxis, but is just a normal city.
Delhi has 6 lanes if fluid traffic that mixes like a stream, cows walking the wrong way, elephants, tuk tuks that have heard of this thing you call lanes and find it a silly idea, and pedestrians that show no fear and believe they are made of iron.
China can be very similar.
It's not even really comparable. Anywhere in the US you at least have lanes of traffic, people driving on the right side of the road, and don't have a gazillion 1930s-looking tricycle carts weaving in and out everywhere... Scariest part to me about China traffic, everyone covers up their seatbelts so you can't use them.