I do love Cockroach, but the old licensing model was pretty brutal if you required any enterprise features (ex: incremental backup).
For reference, some other data stores doing "horizontal scale of writes" ..any others I'm missing ?
* MySQL: Vitess, Planetscale, TiDB, MariaDB Spider
* Postgres: Citus, YugabyteDB, YDB, Neon
* SQLite: mvsqlite, marmot
* Document: ScyllaDB, Cassandra, DynamoDB