Marvel zombies nor the kids and young adults who are their customers (largely) are going to know or care about this kind of stuff. You really have to start running in those circles to see people pointing this out with how bad the art is. Most of their customers are not the kind of people to notice this sort of thing just like how most people who'd eat at McDonalds don't know anything about how that burger is made. The average customer doesn't know nor does it care and just sees the product. That's how most everyone does it and couldn't tell you why it's bad even if they knew something was up.
On the note of big versus little guy though, no. I know enough creators who are independent and colossal pieces of shit. Everyone can be a shithead in this industry.