Generally, the closer you are to "people will die if this code has a bug," the more regulated the industry.
People that don't work in a heavily regulated space vastly underestimate the constraints. It's hard enough to create a product that's beautiful and works well at a price point that the market will bear, but it's often near-impossible to do all this while also complying with all the regulations of all the markets in which you intend to sell your product.
It takes a tremendous amount of commitment, money, and time, and companies that aren't used to working within snail's pace regulatory environments quickly lose focus and the projects sputter out.
Waymo and Baidu can credibly claim they have the people and track record to do this thing. Apple isn't anywhere close.
They could hire people with the expertise, but Apple is allergic to growing engineering expertise outside of Cupertino.
Then again, that isn't necessarily working out perfectly well for Fisker.