It's because Zoox is operating as an independent subsidiary of Amazon, and Jeff isn't holding the reins any more (though Andy is, in my opinion, a worse leader for the company).
I'm sure that Amazon will slaughter the fatted calf once Zoox fully proves out by operating its intended product, though. Can't let anything good exist when you can claw back that billion dollar investment, not to mention years of a surely massive operating budget.
Oh, honey.