For context, Elasticsearch merged their proprietary add-ons into the main repos https://www.elastic.co/blog/doubling-down-on-open and MongoDB relicensed to a not-quite-open-source license that compels you to release code for your entire infrastructure if you're running MongoDB as a servie https://www.mongodb.com/licensing/server-side-public-license... . If you make your money on support and not open core, it's difficult for Amazon to do anything to you, e.g., Red Hat is doing just fine despite Amazon Linux being a thing.

(There's also https://aws.amazon.com/corretto/ , a long-term-support version of the JDK, because Oracle is getting more aggressive about Oracle JDK licensing.)