Redis is no longer free software

The Redis in-memory database system has had
its license changed to either the Redis Source Available
License or the Server Side
Public License (covered here in 2018);
neither license qualifies as free software.

Under the new license, cloud service providers hosting Redis
offerings will no longer be permitted to use the source code of
Redis free of charge. For example, cloud service providers will be
able to deliver Redis 7.4 only after agreeing to licensing terms
with Redis, the maintainers of the Redis code.

Distributors like Fedora are already looking
at removing Redis as a consequence. (Thanks to Emmanuel Seyman).