Mongo and Elastic have changed there licenses to the "service-side public license" (SSPL) which is a particular own flavor of AGPL. The OSI has stated that this isn't an open source license. [1]

Barring a discussion about whether or not a license is "open source", what matters is that these businesses asserted that commonly used licenses - (A)GPL, Apache, MIT,... - are leaving ample room for competitors to setup their own managed / hosted services and compete with them through scale (e.g. Amazon's Open Search offering undercutting ElasticSearch).

[1] https://blog.opensource.org/the-sspl-is-not-an-open-source-l...