Same rendering engine, same lighting, and for the vast majority of them, basically the same rendering settings (as the other person said, tweaking these can actually be quite a lot of work)
As a professional gamedev : good. Except if they aren’t tackling similar issues in online gambling (am at work so I didn’t read the article)
Edit : read the article, they basically only mention displaying the real money equivalent when buying “premium” currency, which is only the tip of the iceberg, but also pretty easy to legislate I guess.