It's common for PE to buy many "mom n pop" practices with the goal of reducing competition (eg https://kgnu.org/investigation-finds-that-private-equity-was... )
Reducing the friction of starting new business is good. But I don't think it's sufficient to protect consumers. (If it was sufficient, we wouldn't need antitrust law at all, right?) For example, the rolled-up firms might have economies of scale that allow it to undercut new competitors.