MongoDB is huge though for all the wrong reasons, businesses think that just because it's JS, they can just have frontend devs - sorry, they are "fullstack" now - doing DBA work.

I worked as one of two NoSQL DBAs for a Fortune 50 finance company, and there is a ton of CV-driven development going on giving NoSQL a bad name. Most use cases don't need NoSQL. And for those which do, NoSQL is almost always harder to implement than simple SQL based RDBMSs.