I realize the math works out, but does seem rather fanciful. So a blackhole is caused, mass goes in, it gets heavier and the event horizon gets larger. Mass i

I realize the math works out, but does seem rather fanciful. So a blackhole is caused, mass goes in, it gets heavier and the event horizon gets larger. Mass is conserved, no magic needed. But at some point mass stops being conserved, a worm hole forms, and matter is ejected from the other side? Despite needing negative mass/energy to keep it open? If this was true, wouldn't there be a max size of black holes? Or maybe a MUCH easier to see white hole for each black hole?