In the first paragraph:

> No existing tool could handle the data security requirements and specific workflows Stripe needed

Size and scale, I would think. An out of the box solution probably doesn't quite have the same capabilities as something they can (and now have to) manage in it's entirety.

Stripe probably WANTS to be opinionated about how their company works with the tools.

Because empire building, why else. They had two other internal tools and now they have three