AWS RDS or GCP Cloud SQL or Azure Managed SQL or IBM Compose or Aiven or any number of other vendors offer managed databases with more features, much higher performance, and far less cost. Even CRDB has its own cloud offering that's cheaper and more flexible than Spanner.
Spanner isn't magic, it's just a proprietary distributed relational database that is strongly consistent (CP) and relies on Google's network and infrastructure to make up for availability as much as possible. CRDB solves the same problems. It was founded by ex-googlers who are familiar with Spanner and the product is production-grade enough to achieve a multi-billion dollar valuation with impressive customers. Plenty of "new-sql" relational datastores have been created that compete and win on both features and cost, because the reality is that the vast majority of companies do not have a scaling problem; certainly not one that can only be solved by Spanner.
It does seem however like you appreciate why Spanner and CRDB are important steps forward. The prices will continue to come down. It will become a de facto sensible solution in production for any reasonably well-capitalized business in the future.
There are dozens of managed database vendors now along with self-service deployments like Kubernetes operators that can scale standard databases as far as you need.