Why do these primitive databases excite people so?
There is much better technology out there at all levels of the cost spectrum.
http://cryto.net/~joepie91/blog/2015/07/19/why-you-should-never-ever-ever-use-mongodb/
MariaDB is going after Oracle in its own back yard with plans for a fresh CEO drawn locally in order to tap funding from A-lister venture capitalists. Patrik Sallner is stepping down as MariaDB Corp’s chief executive for a new job, with the firm’s management now interviewing replacements, The Reg has learned. There are a …
The existing CEO is leaving because he's had a better offer and so now they need to find someone else? This is not usually the sound of success.
MariaDB has been stealing business from MySQL – among them Google – as companies fret about Oracle's control over the project and product.
Postgres has been stealing more and more valuable business. Oracle is doing a reasonable job of cleaning up some of the weirder shit in MySQL.
And with Postgres you can have mission critical, ie. must not get lost or corrupted data, with an optimised binary JSON store for the transient shit that fuels the interwebs.