We see this again and again. The cynic in me sees Stadia as yet another internal promotion scheme, masquerading as a product.
I doubt this will ever change. The internal momentum of the company culture will make it so. What does it mean for investors? Google has enough money they can just buy their way into markets indefinitely. It will probably keep them going, but I don't expect huge growth. I'd probably be putting my money into other stocks if I had to choose. I honestly don't think people would miss Google much if it was gone.
* Nobody is held accountable for the long term success of the product. Making little things work nice is not rewarded. Maintaining UX is defiantly not rewarded.
* Rewarding process over product. That's why you see so many Google products shut down. It takes a few people from L7 to L8 to build it and rewards someone from L6 to L7 to wind it down. Every annual performance review in the process is all roses and rainbows!