>And why Gwen Stacy?
It's because of "women in refrigerators." Despite the name, nobody cares about Alex DeWitt, but Gwen Stacy is the prime example of a character that dies and then serves as motivation for the hero. Feminists say this is sexist against women, even though it happens more often to male characters, like Uncle Ben, Pa Kent, and Jason Todd, but we'll just ignore that. They also ignore that the reason they are even more aware of instances of female characters is because women get automatic sympathy, so their deaths are more effective because the readers are expected to care more, and the fact that the feminists pick the term "women in refrigerators" and not "Uncles and bullets," "Adoptive fathers and heart attacks," or "Robins and crowbars" is precisely because they do have more sympathy for women and care more when they are the ones used as a plot device. So if they were correct that the trope existed, which they are not, then it would be sexist against men in favor of women, just like they are. But there is no pleasing them anyway, so even though their bigoted myopia makes them see a trend that isn't there, and the trend actually aligns with their values, they still get mad anyway.
So since they're mad they have to subvert it. They think they're sticking it to the ridiculous conspiracy theory they call "the patriarchy" by taking and ruining one of the most effective plot elements in long running comic book history, that being Gwen's death. They have to show that she's actually a stryng, yndypyndynt wymyn that don't need no m*n. And they all think it's so fucking "funny," because SJWs don't understand what comedy, or art in general, actually is. They don't believe it exists. They are told the personal is political, that everything has a message. Sure, you can interpret a message in anything. But they take it so far that they do not even attempt to actually make art, because if everything has a message, they take that to mean that nothing is art and everything is propaganda. Or rather, they would phrase it as there not being propaganda, because everything is art. As you've probably noticed in your interactions with them, subtlety and nuance are not their strong suits. So they don't laugh at their "comedy," they clap at it, because they don't seek humor, they seek reinforcement. So they all pretend to laugh and love shit like Gwenpool and the rest, but they don't actually get enjoyment from the art, because it was never made with the art in mind. It was made to be propaganda, and they simply enjoy seeing propaganda with which they agree.
That wouldn't really matter. She is still effectively a multiversal doppelganger. In the Ultimate Universe Doctor Doom isn't Victor von Doom, but Victor van Damme. They're still the same guy. Ultraman is still a version of Superman even though he has a different name, origin, and source of power. Superwoman is Lois Lane but she is also still Wonder Woman. Gwenpool is still a version of Gwen even if her specific story is different, partially because she's really a takeoff of Spider-Gwen more directly than the actual Gwen Stacy. And that doesn't just have importance in-universe, it has importance to the authors, because they still feel they are fundamentally sticking to the evil "patriarchy" that would date have anything negative happen to a fictional female (the same as happens to many fictional males, but we'll ignore that).