Let met just say that as an observer to this conversation -- and someone who believes that compatibility, extensibility, and frankly competition bring out the best in products -- I'm fairly surprised and disappointed with the apparent hostility many community members have shown toward a sincere attempt by another open source product to find common ground here.
Yes, Scylla has a competing OSS project (albeit under a different license). They also have a business built around it. It's hard for me to see that as dramatically different than the DataStax relationship to this community. Though I would love to be shown why.