A singularity being a black hole (bh) which forms when there is sufficient mass in one area. Its often due to stars that burn out and explode but do not eject most of their mass. The mass remaining cools rapidly as nuclear fires burn out. As it cools it contracts which makes its mass fit into a smaller space and become denser. At some tipping point space itself seems to collapse and everything is drawn into the center which is now a bh.
I'm not sure what the exact density is needed to form a bh but its greater than the pressure and density that creates a nuclear fluid, a theoretical state in which there are no atoms just a "fluid" of nuclear particles mashed together. Its a very high density but not enough to make a bh, however we see numerous bh's in the observable universe.
According to the big bang theory, the whole universe began as a tiny dot or even a mathematical point which exploded and over millions and billions of years expanded into stars and galaxies. If this theory is correct, and most scientists and astrophysicists seem to accept it, then the density of the proto universe was near infinity at creation and stayed at a super high density for millions of years. According to what we know, a bh should have been created at the same time.
Does it matter? Only in a theoretical sense perhaps. It would mean that nothing could escape the universe not even light and anything outside the universe would be drawn into it. However it could help explain some things that do not make sense and which seem to violate "laws" of physics that we have agreed upon. Perhaps its our understanding that is wrong rather than the universe refusing to order itself according to our theories?
For example, many galaxies spin at a rate that is faster than the mass and gravity of the galaxy could hold it together and those galaxies should spin apart but they don't. So we came up with "dark matter" which is invisible, can't touch it or sense it in any way but it has gravity which balances the books. Then we see that the observable universe is flying apart and seems to fly apart faster and faster going once again against what our theories predict. So they invented "dark energy" which pushes things apart and supposedly explains the anomalies
How is this any different than what we did in olden times when we couldn't explain something, we invoked fairies, spirits, gnomes, etc with supernatural powers to explain it away. We don't believe in magic or demons anymore so we have to make up a new supernatural force that can not be explained to fill the gaps.
Perhaps, just perhaps, being in a super massive bh means that while the laws of physics work the way we think they do on a micro cosmic scale like our solar system but on a much larger scale other forces take over that we don't understand yet. This would explain why the farther away something is, the greater the red shift which we interpret as speed away from us. Maybe the bh has this influence over a distance of thousands of light years but it not detectable over shorter distances?
We need a 21st century einstien to sus it out because our scientists are baffled. What is your theory?