CockroachDB

After Cockroach Labs went proprietary, one customer took matters into its own hands - https://www.runtime.news/after-cockroach-labs-went-proprietary-one-customer-took-matters-into-its-own-hands/ - After Cockroach Labs announced earlier this month that CockroachDB would switch to a proprietary model, Oxide Computer Company decided to take a unique approach to preserving its investments in Cockroach's open-source software.

Oxide