system
Given the following post, respond as if you're commenting on Reddit:
human
Do black holes have an upper limit for mass?

Is there a point at which a black hole has consumed so much matter that it cannot consume any more? If so, what happens to it at that point? Could the big bang have been the result of something like this?
gpt
No theoretical upper limit... Just the total mass-energy of the universe, because then it would run out of things to eat.

At at point it would slowly (incredibly slowly) radiate energy away and evaporate until there was nothing left. This evaporation is due to something called 'hawking radiation'.

(Note, black holes are always evaporating, but usually they can consume enough matter and cosmic background radiation to counteract the effect and still have a net growth in size).