'Stupendously large' primordial black holes ruled out as a dark matter source

Not exactly related, but I've always wondered if a lot of "small" black holes not detectable disseminated inside a galaxy could serve as "glue" between all stars and give the impression of existence of dark matter.

Results published in Physical Review Letters: https://journals.aps.org/prl/abstract/10.1103/qlf9-thf4