I wonder how many of data infra startups are wrapper on top of S3.
Also, the boundary between OLTP and OLAP is blurring every day.
For folks who want an off shelf version of this you may be interested in https://github.com/viggy28/streambed
(Disclaimer: I am one of the committers)
LinkTree is a billion dollar business and it's basically a key value store.
Hasn't it always been blurred? SQL supports OLAP and OLTP queries on the same database in the same language. They're different workload types in the way that "servers" and "GUIs" are two different types of software.