Also the reason Redis Labs made the controversial decision to change their licensing (and they reference Elastic in it) [1].
[1] https://redislabs.com/blog/redis-license-bsd-will-remain-bsd...
> Cloud providers have been taking advantage of the open source community for years by selling (for hundreds of millions of dollars) cloud services based on open source code they didn’t develop (e.g. Docker, Spark, Hadoop, Redis, Elasticsearch and others). This discourages the community from investing in developing open source code, because any potential benefit goes to cloud providers rather than the code developer or their sponsor.