I guess it’s not just a matter of who makes the hub.
X-Trackers are a very unique product. It's interesting to see a display at Napa advertising them. They're not really a part that an average consumer or a repair shop would ever opt to purchase. Typically, buyers specifically seek them out to purchase.
Pre-bankruptcy GM vehicles chew through parts store wheel bearings. Doing side work, I install X-Trackers where I can. Parts store wheel bearings are about $40 for a 2000s Grand Am or Malibu. X-Trackers are $90. It's a pretty hard sell at twice the price for vehicles like this. It's an easier proposition for someone with a full size truck or SUV, which people keep longer and are willing to put money on premium parts.
SKF actually makes a hybrid ball bearing/tapered roller bearing in the X-Tracker line for full size Dodge and GM trucks and SUVs.
Then there is the Corvette X-Tracker. The Corvette tax means it's exactly twice the price ($260 vs $130) of an already expensive regular SKF bearing.