I kinda expected this after recently revealed AWS Managed Kafka. AWS can afford to release half baked products because platform inertia and that will easily cannibalize whatever traction SaaS offerings of Elastic, Kafka, Mongo etc has.
That's a great point. I can only hope that platform providers who productize open-source packages are giving back a significant chunk of revenue to the project, either in cash or in employees contributing labor.
It's safest to assume they are not giving back anything, unless they provide evidence otherwise.