[$] Redis modules and the Commons Clause

The "Commons Clause", which is acondition that can be added to an open-source license, has been around fora few months, but its adoption by RedisLabs has some parts of the community in something of an uproar. At itscore, using the clause is meant to ensure that those who are "selling" Redismodules (or simply selling access to them in the cloud) are prohibited fromdoing so-at least without a separate, presumably costly, license from Redis Labs. The clause effectively triesto implement a "no commercial use" restriction, though it is a bit morecomplicated than that. No commercial use licenses are not new-the "open core" businessmodel is a more recent cousin, for example-but they have generally runaground on a simple question: "what is commercial use?"