CockroachDB's license is exactly what we're studying. We're also eyeing their technology for future use, though for the moment stock PGSQL still wins due to query complexity.
I'm curious to understand why you're so anti-GPL though. Linux is GPL and it hasn't stopped people from using it.
The GPL is not perfect but at the time we adopted it there were no other good alternatives except more permissive licenses that would have led to other companies just taking our stuff and monetizing it without compensation. We are not interested in charitably donating free labor to Amazon.