This was my takeaway. Amazon is basically squeaky clean as long as they avoid modules but everyone else just using a module on a redis install for a k/v databas

This was my takeaway. Amazon is basically squeaky clean as long as they avoid modules but everyone else just using a module on a redis install for a k/v database? You're now subject to additional license fees. It's not as sexy as redis but Memcache has none of these license issues and would be sufficiently usable for k/v data where I work. It's not vaugely licensed either. Congrats Redis Labs, you played yourself.