I built a Reddit clone in 2 weeks using Bubble: nocode
old.reddit.com
old.reddit.com
Nocode is a myth.
I suppose nosql for db migrations makes things a lot easier.
But, Bubble has an API connector that can query data in and out a third party data source (in my case its a Postgres that I access over REST calls).
Bubble's data layer is terribly slow. I'd recommend maintaining the bulk of your data in an efficient self-hosted or managed instance
Vicious circle :p