My theory is this was a ploy to make use of idle cloud resources Google invested in for GCP. If that is the case I have much less fear of it just being shut down since its just gravy on top.
But similair things were true for lots of dead products, and google's willingness to launch a large number of products and only keep the ones that gain massive market traction shows just as much paranoia about ending up with a stable full of lqggards and weak brands.
If user growth flattens out after two years, be nervous.
What will happen to the service when the people first involved have moved on and they have trouble finding engineers wanting to work on something that's not brand new? Wasn't that why they cancelled Reader?