That’s… not how that works.
The brand isn’t “x.com” either, it’s “X”. They don’t even use x.com as a domain.
Even if it was x.com, a video game being called Xcom wouldn’t be close enough to the website x.com to be able to be confused. It would be different if they both were websites.
The NSA benefits greatly from knowing how many Pidgeys you’ve got, you’re right