It makes sense they prototyped it. But putting it into production is $$$, way more expensive than current street view.
Current street view works well enough. How is a massively upgraded 3D version, that is bloated and slower to use on older devices, going to make Google more money?
It feels more like a separate product to license to architecture firms, city planners, video game studios, etc.
Adding a bonus 3D renderer on top is just a nice-to-have.
Or maybe you learn this helps you build a world model that would have accelerated Waymo's progression, or you sell it to robotics companies.
That's the nice thing about having a money printer and a ton of smart, curious, and driven people. You can afford to do things without a strict eye towards profit, that's reserved for tiny companies living on a razor's edge. Or consultants I guess.
But yes, that is the nice thing about the money printer -- they were able to prototype it, and maybe it is helping Waymo.
But there isn't a strong need for it to live as a product within Google Street View.