As far as I’ve seen that’s as far from the truth as it can be. They in fact consolidate terrible businesses, undercut the good ones and drive them out of the market until only they are left, after which point, they get even worse.
Crows deliberately spreading plague in order for there to be more corpses to feast on, to take the parent's metaphor further.
But seriously. Are there anyone who hasn't interacted with a business systematically enshittified in one form or another by PE?
From what I've seen, they take a terrible business and liquify its valuable assets for their investors, freeing up capital to be invested more productively elsewhere in the economy. Of course those investors could take the money and commission a bunch of statues of themselves, but frequently they do something more productive than that.
A lot of the negative reaction to them seems to me to be mostly emotional. They'll dismantle a business that holds a lot of nostalgic value for people, even though it's long since ceased to be a viable and productive company. But it wasn't their fault that the business was in that situation in the first place! Years of mismanagement and neglect or perhaps disruption from a competitor left the business in zombie-like state. PE came along and put it out of its misery rather than allow it to slowly crumble while depreciating the value of its illiquid assets.