I recommend reading this 3-part series on Mongo's marketing - it goes into a lot of detail why Mongo "won". https://www.nemil.com/mongo/1.html
As a former RethinkDB user (we have migrated to Postgres) I actually don't miss it as much as I would - JSONB in PG does what we need, and the real-time features of RethinkDB never really delivered because of various performance issues in the database itself.
As a former RethinkDB user (we have migrated to Postgres) I actually don't miss it as much as I would - JSONB in PG does what we need, and the real-time features of RethinkDB never really delivered because of various performance issues in the database itself.