It's a nod to the singularity (a.k.a. a black hole). https://en.wikipedia.org/wiki/Technological_singularity. That's all these AI people can think about. Makes sense to me. It's near!
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Assuming the technological singularity is always trying to gain more information and quicker than it did the previous clock cycle, I would think it would both expand out to grasp new information as well as make what it has more dense.
Information presumably takes up some space and has some mass. Ever increasing the amount of it and confining it in a smaller and smaller volume of space would I think lead to a gravitational singularity.