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.
Bill Gates, Steve Jobs, Elon Musk - founders at the top who owned it.
More directly, Gabe Newell and Valve.
It might be that google started with Page/Brin and co-ownership might have weakened that a bit, and now they are not to be found.
Not that a single founder is a surefire recipe.