I'm just remembering the sad collapse of RethinkDB...
The task of making a viable commercial database in 2020 is herculean and I can really empathize with the team's need to both keep cashflow and have a sufficiently sized deployment to debug against.
Can also say that everyone I've met at nubank are really passionate about the ecosystem and seem like they'll be excellent partners
I'm excited to use the pipeline operator but I was burned when I adopted a library (https://github.com/danprince/zaphod) which used the function bind operator only to find that lost major steam in TC39 process
Out team chose Datomic for it's graph like properties and emphasis on data locality. This is optimal for GraphQL style patterns where you'd otherwise join a million tables
Meteor is one of the most comprehensive and smooth frameworks for making web applications available today. It solves a ton of problems with a few overarching concepts: http://docs.meteor.com/#sevenprinciples