As a result BHs defy the 2e law of thermodynamics, as we observe around Ball lightnings producing heat and plasma out of the oscillating ZPE vacuum.
BHs do not eat mass (Fermions) they only merge with smaller BHs and and the local Axion/Higgs vacuum particles, growing bigger and bigger all the time.
However small ( micro) BHs like balllightning are not stable and decay, ( evaporate into vacuum particles).
Sunspots seem to be big enough BHs to be stable growers.
(according o Quantum FFF Theory)