Antirez very consciously and specifically chose the BSD license for Redis with the exact expectation that companies will be more likely to contribute back to up

Antirez very consciously and specifically chose the BSD license for Redis with the exact expectation that companies will be more likely to contribute back to upstream if they are adopting and improving it without a legal stranglehold requiring them to do so. Maybe he has equity, maybe not. I hope he does. But a company profiting off of Redis without contributing back is a very conscious choice by the author and not at all the fault of weak copyright enforcement.