“In order to ensure open source versions of both packages remain available and well supported, including in our own offerings, we are announcing today that AWS will step up to create and maintain a ALv2-licensed fork of open source Elasticsearch and Kibana.”
Two days after Elastic blamed Amazon for its license change, Amazon announced a fork and called it stepping up. Note the phrase “including in our own offerings.” This is not charity. AWS is protecting a product it sells, and wrapping it in the open source flag.