The thing I notice most with a lot of modern monster werewolves is how the bite seems to work more like a contagion or a curse that turns people into these rabid beasts, not a lunar curse on a person or a family line. In older stories, the werewolf was often a solitary, tragic figure wrestling with his own nature. Now, in paranormal romance or monster romance especially, the werewolf is frequently part of a pack structure, with an alpha hierarchy that feels borrowed from wolf biology documentaries. The monster version leans into the animalistic side—less about a man turning into a wolf, more about a man becoming a predator that happens to be fur-covered. The transformation is often painful and violent, and the resulting creature might be more monstrous, bipedal, and terrifying than a natural wolf.
Sometimes I think authors use 'monster werewolf' to sidestep the baggage of the traditional myth and just go for a feral, possessive dynamic in romance. The rules are simpler: you get bit, you change, you're part of a new ecosystem of creatures. There's less guilt over killing and more focus on survival instincts and pack politics. It makes for a different kind of conflict, one that's external—against other packs, hunters, the world—instead of primarily internal.