Okay, here's the real problem that Notch is worried about.
Every game and app that has "Microsoft Certified Safe(TM)" is one more reason the average user will be reluctant to run apps or games that are not "Microsoft Certified Safe(TM)".
They are worried that the next batch of indie games will, instead of running, pop up a window "Microsoft has not certified this app as safe. You can be infected with viruses, or key loggers can steal your bank accounts. Do you still want to run this uncertified application?"
In the PC gaming community, I'm in that group by the way, that sort of thing will be met with anger and derision because it's already a common thought that Microsoft does nothing but crap on the PC gaming community. Look into Games for Windows Live, or whatever that call that crap now, to see what I mean. Microsoft's presence in the PC gaming space is a joke and they have a long, hard road to go down to get past that. Labeling games that have yet to be certified, at a cost I'm sure, as unsafe and vectors for malware installations will do nothing to alleviate that attitude.
Notch is right, anything that Microsoft does relating to PC games is of concern because it appears they go out of their way to ruin the experience to get you to switch to the "superior gaming experience" of the 360. Where of course they control everything and make money off of other people's work.
Every game and app that has "Microsoft Certified Safe(TM)" is one more reason the average user will be reluctant to run apps or games that are not "Microsoft Certified Safe(TM)".
They are worried that the next batch of indie games will, instead of running, pop up a window "Microsoft has not certified this app as safe. You can be infected with viruses, or key loggers can steal your bank accounts. Do you still want to run this uncertified application?"
It's not about the big assed buttons.