SUMMARY
Copyright. The first images of Supermassive Black Holes (SMBHs) M87* and SgrA*, obtained by the Event Horizon Telescope (EHT) collaboration, opened the road for the verification of modified gravity. Meanwhile, the sizes of dark spots in both EHT images are suitably smaller than the corresponding black hole shadows; see Equation (A10) in Appendix A for a useful formal expression of the classical black hole shadow. There are at least five different methods known to contain spins of SMBHs: thermal continuum fitting, disk reflection modeling, high-frequency quasi-periodic oscillations, X-ray polarimetry, and using the EHT images . . .
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