Why is this such a big deal? It's not the first time it has happened and not the last.
Because Apple likes to distance itself from being a game publisher as much as possible. They act like they are above games and that games are only a fraction of the reason why people use their devices. So for them to do something like this, it goes against that whole mindset.
Games ARE only a fraction of their services. Hardware makes up the majority of their profits, which they put out in their earnings call, which anyone can look up. They have never said they are above games, they always demo a game to show off their latest hardware. The conclusions people are jumping to are really bizarre.
In any case, I'm also in the "why is this news?" camp.