Black holes were never discovered or observed, they were invented.

The invention of black holes is often credited to Karl Schwarzschild (1873-1916): In 1916, Schwarzschild, a German physicist and astronomer, provided the first exact solution to the equations of general relativity, which described the gravitational field of a point mass. The radius now known as the Schwarzschild radius is the radius within which a mass must be compressed to form a black hole.

Using math to do science is debunked, string theory explains that math cannot replace the scientific method and cannot be used to describe the universe. The method is false, and it is highly likely that black holes do not exist.

There is a huge amount of so-called physics that is theoretical and false, along with black holes. The point is, just because the math says they exist does not mean they exist.

In short, the universe is too elegant for dumb black holes that serve no purpose to exist.

Scouring the cosmos to them find any artifact to then call it a black hole is so false. It is extremely invalid to predict by mathematics and then search for observational evidence to support the math.

It is not science, and it is not the way science is performed. It took string theory to realize that replacing the scientific method with math is an error, and black holes pre-date the error.

There are many other discoveries in physics that fit the unobserved prediction, people are in a celebration over the so-called findings but looking further it ignores much to make it fit, and it raises questions about all that was conveniently ignored to selectively only focus on what fits, suggesting that there are more incidents of fake science. For instance, smashing atoms and identifying 50 sub-atomic particles, but you only need one and so you pull up the nearest one that fits and voilà, you found the mythical predicted particle. It is false.