I think we’d need to know exactly what dark matter was to determine what caused the amount of hydrogen created, which we dont.
The hydrogen was somehow drawn by the gravitational field created by dark matter make the clumps/clouds more and more dense, thus creating helium and the denser these clusters became still, the first stars where created.
In short, nobody knows until we figure out dark matter. Not scientist, but this is the best ELI5 I could come up with, with my limited knowledge on the subject.
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