[kataklasm]

To expand on this, as stated in your source:

> [270B solar masses] is the maximum mass of a black hole that models predict, at least for luminous accreting SMBHs.

as well as:

> The limit is only 5×10^10 M [50B solar masses] for black holes with typical properties, but can reach 2.7×10^11 M [270B solar masses] at maximal prograde spin (a = 1).

However in the chapter before, it's stated:

> New discoveries suggest that many black holes, dubbed 'stupendously large', may exceed 100 billion or even 1 trillion M.

[throwaway81523]

There's a theory that the universe we live in is itself inside a giant black hole. No idea how it is supposed to have gotten so biig.

[sesm]

If you assume constant density, anything becomes a black hole at certain volume. The question is: is our universe big enough to be a black hole or not.

[mr_mitm]

It couldn't have, the theory is nonsense.

[abtinf]

> giant

How would we know the size? Relative to what?