FULL SPOILERS ahead obviously!!
The end of Jurassic World: Fallen Kingdom takes the series in a dramatic new direction. Isla Nublar has effectively been destroyed – or at best, turned into an uninhabitable rock just off the coast of Costa Rica.
But more importantly, the dinosaurs are now free. Properly free.
During Fallen Kingdom the natural order appears to be reasserting itself, ushering the dinosaurs towards extinction once again. Even Claire, who for the majority of the movie advocates their conservation, decides to let them go the way of, well, the dinosaurs, allowing them to be poisoned in the lab beneath Lockwood’s mansion.
But at the very last minute, Maisie, let’s them go, and pushing all subtext firmly to one side, says, “I had to. They’re like me. They’re alive.”
Source: IGN.com Jurassic World: Fallen Kingdom Ending Explained