@shironeko No CLA necessary. Redis is simply exercising[0] their rights under the BSD license.
This is what happens when people use a permissive license and the project is run by one central entity, which then does a gradual bait-and-switch, what @webmink calls a "rights ratchet", see his posts for more on this.
[0] and overstepping, but they wouldn't have to, that's just clumsiness on their part