Why? Most graviton pressure comes from the anti symmetric Vacuum pressure,(image:3) therefor, it shows mainly infinite speed results. from the vacuum (see: Tom van Flandern) However,the LIGO merger gravity waves speeds tell that gravity measures the speed of light.!!
So: Quantum Gravity is a dual quantum pressure effect on fermions
(by Gravitons: (6) and vacuum Axions: (3)).
Wikipedia says on gravitational merger waves:
"Gravitational waves are disturbances in the curvature of spacetime, generated by accelerated masses,
that propagate as waves outward from their source at the speed of light. "
see: https://www.wikiwand.com/en/Gravitational_wave
Only a tiny part gravitons, in contrast all other photons seems responsible for the rest gravity, these photons leaving the earth, are created by the vacuum Axion transformation by collision with Fermions in the earth. (Q_FFF Theory).
see: "What is Wrong with Current Physics"
https://vixra.org/pdf/2101.0131v2.pdf
Black Holes do not emit gravitons , consequently only the instant vacuum pressure of the dark energy /Axion-Higgs vacuum photons is involved.