Marvel's Avengers is a product of a strange time in the historyꦫ of Marvel Comics, as it clearly uses the Inhumans as a stand-in for the mutants from the X-Men - something Marvel was trying to float in the days before the Disney/Fox deal.
The original Inhumans were a species created by Jack Kirby and Stan Lee in the '60s, wher𝐆e they debuted in the pages of the Fantastic Four comic series. They were written as a secretive species who lived on Earth's moon and who used the mysterious Terrigan Mist to give themselves powers. They would make infrequent appearances over the decades, but they were usually a footnote compared to the other heroes and villains.
There was a period of time when Marvel tried to do something more with the Inhumans, or rather, the Terrigan Mist. In the 2o13 "Infinity" event, a Terrigan bomb is detonated during a fight between Thanos and Black Bolt (the king of the Inhumans), subjecting some of the people on Earth to a process ꧑called Terragenesis. This led to some humans developing powers and becoming Inhumans.
It was clear to the fanbase what the true meaning of this storyline was. At this point in time, Fox still owned the rights to the X-Men movie franchise, including characters related to X-Men books (with a few rare exceptions, like Quicksilver and Scarlet Witch). This meant that Marvel Comics kept trying to push the X-Men out of the limelight as much as possible, in order to focus on characters who could appear in the MCU. It's for this reason why the 🐈Inhumans suddenly became a huge deal, as they were meant to be a mutant substitute. This would allow Marvel to essentially create its own mutant species for the MCU without needing to deal with Fox. This is also why Inhumans were used in Agents of S.H.I.E.L.D.
There was just one problem with this plan - no one cares about the Inhumans. There is a reason why they were bit-part players throughout their run and why they rarely showed up outside of global-scale conflicts. The fact that the Marvel's Inhumans TV show bombed and is one of the few major missteps of the MCU was also a huge factor in souring the opinion of the Inhumans. Marvel's grand attempt at turning the Inhumans into the new mutants failed. Fortunately, the Inhumans are no longer needed, as🐼 the Disney/Fox deal in 2019 means that mutants and the X-Men can appear in the MCU from this point on.
So, what does any of this have to do with Marvel's Avengers? Kamala Khan is an Inhuman and the treatment of Inhumans in the game is reminiscent of how mutants are treated in the X-Men franchise. It's obvious that the story of the game was developed in the period when Marvel was still trying to make Inhumans a thing, as the Fox deal was still several years away. By the time the deal went through, the game was far too long in development for things to change. Even if the deal had gone through a few years ea๊rlier, it's unlikely that Marvel would have wanted to use the mutants in a big game so soon, considering that they are clearly being saved for something big in the MCU.
This leaves Marvel's Avengers as a cuဣrious relic from the time when Marvel was trying to develop something thatℱ was trying to be both new and familiar, but it's obvious to everyone playing that the Inhumans are a poor stand-in for the mutants and their shared history from the X-Men comics.
Marvel's Aveng𒐪ers is available on PC, PS4, Xbox One, and Goo♚gle Stadia now.