The X-Men have been forced to accept villainous help in the past, leaning into the franchise's frequent exploration of redemption and corruption. Their most recent team-up crosses moral lines, however, recruiting Avengers and villains alike. In doing so, the team might have established an old enemy as a potentially important piece of Marvel's future.
Source:https://www.cbr.com/xmen-hellfire-club-remix-new-illuminati-marvel-comics/