As the universe condenses into more black holes at an accelerating rate (over one a day now) there is a corresponding growth in the void areas. As the black holes are more numerous the void spaces are larger

Voids are not created by black hole formation.
To make a black hole requires a great density of matter, as in a collapsing super-giant star.

Galaxies have central black holes that do not swallow the galaxy and create a void.