Why is it impossible for a Quasi Star to exist these days? [duplicate]

I've heard about quasi stars a while ago, but I've just recently decided to go more in-depth about the characteristics and facts about them. I learned that they gain their energy through radiation when matter falls into the black hole in the core. I may be wrong about this part, though. I also learned that they can't exist these days because the universe's gases are polluted with metals. Why does that stop quasi stars from existing?

Edit request from comment: A quasi star is a hypothetical star that existed in the early ages of the universe. It got its energy from a black hole at its core, unlike normal stars that get energy through nuclear fusion.

https://medium.com/predict/quasi-stars-black-holes-at-the-core-of-the-universes-largest-stars-38bfbc4e1b95

If you would like more specifications, please tell me

A relevant paper, cited by the wiki article for quasistars, is the work by Begelman $$\it{et~al.}$$ (2007). They show that newly formed quasistars should have surface temperatures higher than 10,000 K (9,700 °C). As a quasistar cools over time to a limiting temperature of 4,000 K (3,730 °C), for metal-free (Population III) opacities, at and below which hydrostatic equilibrium is no longer sustainable, the end of the quasistar's life leaves behind an intermediate-mass black hole.