Two key differences: Linux is (mostly) licensed under the GPL version 2.0 only, and has diverse copyright ownership. No single person or entity can change the license. That means no one can pull the rug from under the community like the Redis change (and so many other corporate-controlled, copyright-assigned, non-copyleft projects).
(Linux also has a huge pool of users and contributors, which discourages hostile forking, even if the licensing wasn't a factor.)
(Linux also has a huge pool of users and contributors, which discourages hostile forking, even if the licensing wasn't a factor.)