Like, contributing back? AFAICT Amazon did contribute back to ES, in the form of code.

Running a profitable business to service free software has nothing to do with the philosophy.

"When the service launched, imagine our surprise when the Amazon CTO tweeted that the service was released in collaboration with us. It was not. And over the years, we have heard repeatedly that this confusion persists. NOT OK." https://www.elastic.co/blog/why-license-change-AWS

"Free Software" is not about the license but the philosiphy.

"Open source" on the other hand...

Regardless, neither helps with Elastic's problem (if we accept it as a problem).