1) No that's not what AWS did at all. They implemented the MongoDB API on top of their own storage layer. It doesn't use PostgreSQL.

2) Of course. But MongoDB is orders of magnitude faster in some cases, has better horizontal scalability capabilities, better drivers and some nicer semantics e.g. around streaming.

It’s webscale!

I actually recognize threeseed's name over the past five years as being a staunch MongoDB proponent.

https://hn.algolia.com/?sort=byPopularity&prefix&page=0&date...

No hate, just always amused me that someone on HN had MongoDB as their hobby horse.