Redis was open before the trademark was acquired from antirez by Garantia Data, who then re-branded themselves as RedisLabs, and then as Redis. This was definitely not a predestined outcome, there are plenty of other foundational open source server software that transitioned to a software foundation. While I worked on the redis core team (https://redis.com/blog/new-governance-for-redis/), I advocated to move it to a foundation.