Your answer suggests that you don't fully understand what problems Spanner is solving and why it's worth paying for that. CRDB is improving but I don't think it's consensus production-grade quite yet.
You compared it to open-sources databases and having a full-time engineer (while overlooking managed solutions). If those problems were unsolvable by other systems then what exactly were you comparing?
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.
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.