There are certain rules that even the most extreme objects in the universe must obey. A central law for black holes predicts that the area of their event horizons — the boundary beyond which nothing can ever escape — should never shrink.
https://news.mit.edu/2021/hawkings-black-hole-theorem-confirm-0701
https://news.mit.edu/2021/hawkings-black-hole-theorem-confirm-0701