I enjoyed this article very much.

The open source debate is an interesting one. OpenSSL is open source so any company that trades over the internet is trusting their most important interactions to open-source.

Android is open source so it facilitates their confidential communications. Ios is based on BSD so there's no escaping it there either.

For me open source means I can choose to look at the source code.

It is neither a statement of quality or price. I've seen expensive open-source solutions and I've seen high quality open source solutions. The two categories don't necessarily collide.

When talking about a model DB I think it is worth stressing that it is not the system model DB but a statistical model DB.

As a DB guy with developer leanings I was initially confused by what data scientists and SAS jockeys refer to as a model. The main point of confusion was when I took delivery of a model and to me it looked like a collection of cross tabs. I had some interesting discussions about how the model would react to new data, how it would update, how long it would take to update etc. All amicable but a real eye opener