"the Surf game its engineers had built into the new browser"
Yes, because it is so important that a browser has a built-in game.
Look, it was funny back in 1996, but nowadays you can just make it an add-on. All browsers have add-ons. This programmer thing about building games into applications that are not games needs to stop.
Besides, Microsoft, you have more important things to do then patch a browser game, and since it is built-in, you know as well as I do that you'll have to patch it one day.
Besides, you're not proving anything any more. When Excel 97 was revealed to have a flight sim hidden in it, it was impressive because file sizes were a thing in those days, and memory was scarce. Today you're playing with gigabytes on disk and in memory, so you're not showing off your programming chops anymore, you're just demonstrating that you can waste your time.