There is a fundamental misconception about how software licenses and copyright work. Since Redis Labs relicensed Redis, I've read multiple times that it would not have happened if Redis had been GPL-licensed. This is incorrect. The entity (or entities if they all agree when there are multiple copyright holders) owning the software, company or individual, can relicense it at any time, and no license can change that.
Using the GPL license would also not have prevented Amazon from making money by hosting Redis (nothing wrong with that btw). Making it AGPL would have forced them to release any modification, but then again if it was AGPL, lots of companies would not have touch it (for good reasons).
There is absolutely nothing stopping anyone from forking the last BSD-licensed release of Redis and continuing the work with another name ("Redis" is a trademark that belongs to Redis Labs).
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