All that aside, let's get down to mocking this hot mess. The most blatant bit is that it's supposed to be a "Marvel" shirt, but is obvious not Marvel at all. Oh, I'm sure that Marvel and Disney would love to get their hands on the Superman cashcow, but it'll never happen. Even if Disney could buy DC Comics, I doubt the Federal Trade Commission or the DoJ would sign off on a single corporation owning the two biggest comic book companies in America and probably the entire world. It would give Disney a virtual monopoly and would be unfair to the rest of the industry. I'd imagine that that's the reason why Warner Bros never swooped in and bought Marvel. The only other way Marvel/Disney could ever get their hands on Superman would be a trade, but I don't think they would be too keen on losing their entire A-list roster and the MCU as a result.
The peculiarity does raise the question of why a Superman shirt was used in what was clearly supposed to be an ad for a Marvel-branded shirt. Like, did the person who put it together just not know? But how? Superman is one of the most famous, if not THE most famous pop culture icon and I'd have imagined that just about everybody knew he flew the DC banner. Does their ad person live a boring life bereft of interaction with popular culture? I mean, it could be something as simple as them just choosing a picture of one of their shirts at random and slapping it into the ad without a second thought.
The other thing I want to mock is the shirt itself because I haaaate the Man of Steel Superman costume. What is it with movie costumes and the "need" for fake muscles? And what was wrong with the yellow belt and red tights? Christ alive, Superman's costume is supposed to be icon as dicks, not generic gritty. Also? STOP TRYING TO MAKE SUPERMAN FUCKING GRIM AND GRITTY BECAUSE IT WILL NEVER WORK.
*deep breath* But I'll save that rant for another day.
Finally, thirteen bucks for a t-shirt? I can grok a long sleeve costing a bit more than a regular tee, but thirteen bucks? No thanks.