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Pryamvade Nataraja is convinced that dark matter is just trillions of black holes. Primordial black holes. James Webb will try to find out more. Sounds pretty plausible. I think she's right. Why not? No strange particles needed. Already in the sixties the idea was proposed.

One can read in this article that LIGO observations don't rule out PBH as a candidate for dark matter.

Primordial black holes (PBHs) in the mass range (30-100) M⊙ are interesting candidates for dark matter but are tightly constrained by the LIGO merger rate. In deriving these constraints, PBHs were treated as constant Schwarzschild masses. A careful analysis of cosmological black holes however leads to a time-dependent effective mass. This implies stricter conditions for binary formation, so that the binaries formed merge well before LIGO's observations. The observed binaries are those coalescing within galactic halos, at a rate consistent with LIGO data. This reopens the possibility of LIGO mass PBH dark matter.

So they could fit the bill.

Why isn't this idea more popular? What's there that advocates against it?

Qmechanic
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MatterGauge
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There's an upper size limit to the individual black holes in a "all dark matter is black holes" model due to the non-observation of gravitational microlensing by dark matter, which leads most people to think that diffuse weakly interacting particles is more likely than black holes are.

https://en.wikipedia.org/wiki/Massive_compact_halo_object

https://en.wikipedia.org/wiki/Weakly_interacting_massive_particles

Zo the Relativist
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