This kills it.
AGPL, I could go with. AGPL/proprietary dual licensing works well. There's an open ecosystem and a closed one.
Non-free is a non-starter. It's no longer GPL-compatible. EVERY project under the GPL using redis now has a potential legal liability from (what's looking like) a sleazeball company.
Now I need to figure out if I should move to a fork or switch to a different package. Fortunately, I have a nice key-value store abstraction, so it's easy to switch.
I expect distributions like Debian, and Ubuntu by proxy, will move away from having a redis .deb as well.
The damnable thing here is the dishonest copy: "In practice, nothing changes for the Redis developer community who will continue to enjoy permissive licensing under the dual license."