tl;dr 2.0:<p>1) MongoDB Inc have made a &quot;foreign data wrapper&quot; for PostgreSQL which enables MongoDB databases to be accessed from within PostgreSQL.<p>2) This makes data in MongoDB databases accessible to existing analytics software for SQL databases, which is often made by companies with lots of money.<p>3) The CTO of SlamData Inc, which makes analytics software for NoSQL databases, thinks that MongoDB Inc shouldn&#x27;t have done that.<p>tl;dr 3.0:<p>A company faces increased competition; isn&#x27;t happy about it.