Open Source is established term which offers specific freedoms which brings specific benefits (and challenges) to businesses.

While many Venture funded companies might want you to believe they are being unfairly taken advantage by the clouds it is not the full story.

Elastic for example relies on A LOT of code contributed by community, which were contributing because they could use end result under Open Source License.

Elastic changing the license changed relations here to you contribute to create the product BUT you do not get all the rights to use it any more.

In Elastic case in particular large number of cloud solutions were build which embed their solution (arguably same as Elastic embedds Lucene) who could not use Elastic after license change.