It's targeted to large datasets more than companies. There isn't really any advantage of a single node Cloud Spanner instance over Cloud SQL. Cloud Spanner beco

It's targeted to large datasets more than companies. There isn't really any advantage of a single node Cloud Spanner instance over Cloud SQL. Cloud Spanner becomes worthwhile when you have more data/throughput than a single node system can support, at which point the pricing is competitive with other options.