There is a video with John Baez and Philip Gibbs explaining why this is a common misconception. It's the same family of conceptual error, where things lining up just right allow incorrect conceptual reasoning to land at a correct answer shape, that allowed John Michell to work out the Schwarzschild radius of a star in the late 1700s.
With the blackhole universe picture, causal boundaries and spacetime's evolution aren't properly accounted for once we step out of a static picture.
Incidentally, the cosmic object we are more likely to be inside of is a white-hole.
BoiledCabbage · · focus · HN ↗
<a href="https://en.wikipedia.org/wiki/Black_hole_cosmology#Evidence" rel="nofollow">https://en.wikipedia.org/wiki/Black_hole_cosmology#Evidence
Vetch · · focus · HN ↗
With the blackhole universe picture, causal boundaries and spacetime's evolution aren't properly accounted for once we step out of a static picture.
Incidentally, the cosmic object we are more likely to be inside of is a white-hole.
<a href="https://www.youtube.com/watch?v=ULjLGTd3-4s" rel="nofollow">https://www.youtube.com/watch?v=ULjLGTd3-4s