Thanks for the link. Just found this one from NASA as well: https://www.nasa.gov/feature/goddard/2016/nasa-scientist-suggests-possible-link-between-primordial-b

Thanks for the link. Just found this one from NASA as well: https://www.nasa.gov/feature/goddard/2016/nasa-scientist-suggests-possible-link-between-primordial-black-holes-and-dark-matter https://www.nasa.gov/feature/goddard/2016/nasa-scientist-sug... So, it seems like it's still an open possibility, and even better, it might be resolvable one way or the other in the near future -- at least for the primordial black hole hypothesis.