We can see Hazard when he was at Real Madrid, previously he was a great player, he was even the player who was the main choice at his previous club. However, when he couldn't compete with other players in the squad, he became a player who always sat on the bench. This has the potential to happen to all players, including Mbappe. Even though he is a star player, he also has to work hard to always perform well.
What happen to Hazard was constant severe long-term injury but for Mbappe, he's no such player that picks up injury, he's not vulnerable to to these critical conditions and will always belt up for challenges. Eden Hazard prime ended the moment he agreed to move to Real Madrid. The Belgium international had golden opportunities but he failed to meet them up because he lost form and couldn't comprehend the desirable expectations from fans. But in Kylian Mbappe case, there's none like this and we know how important this particular move is for Mbappe, he's here to win major trophies and will do everything within his possession to ensure he's having a smooth run in Real Madrid, his new team.