It's something they could only enforce in the limited context of gaming. Just like "Apple" can be trademarked specifically in computing. You couldn't sell apple

It's something they could only enforce in the limited context of gaming. Just like "Apple" can be trademarked specifically in computing. You couldn't sell apples and trademark "apple" in that context because it would unfairly prevent others from selling apples. But Apple gets to protext themselves from a proliferation of companies named "Apple Computers", "Apple Computing", "Apple Computer", "Apple Computor", etc.