I think the (A)GPL related issues around the RethinkDB code might've left some bad taste in the mouth of certain people. There also are people that for various

I think the (A)GPL related issues around the RethinkDB code might've left some bad taste in the mouth of certain people. There also are people that for various reasons, well informed or not, don't want (A)GPL code in their stack which might limit the ability to sell this. However, I don't see anything related to the use cases in the article that would make GPL be an issue. Unless they want to build proprietary extensions to the database. Considering they've released the code related to the Postgres rewrite as AGPL that seems even stranger.