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.