Well, even if WE do not have 64TB tables (where one need low latency for the entire table), I believe there are plenty of other mature NoSQL offerings out there? Whether you go to the other cloud vendors or self host.

Cosmos is at best unfinished. I used Google Data Store for years and it was finished in the sense that it always did what it says on the tin and didn't cause lots of problems for you (although I think higher latency than Cosmos, so may not be for every usecase -- there is also BigTable and Spanner).

And I don't believe Google would ever have done something like deploying a shared multitenant Jupyter system with full access to all customer's DB. Microsoft actually did that.

As I said the main problem is mainly how Cosmos is marketed, as a general purpose NoSQL. If it was marketed with all the caveats you learn about after you go live, and people only used it if they really had to, it would be a bit different.

Though realistically it would drive most people to other cloud providers.