Well, I don't think it's "very obvious", nor do I think "it is clear they are doing dated / junk / minimal typesetting / formatting". I guess I'm not seeing the evidence the same way.
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I read your links, and I think the most interesting relevant one with good numbers is the svpow.com link.
The StackExchange one says "34%" of their cost is "editorial and production". That includes more than type-setting, so it's not clear what subfraction is pure type-setting, and whether it's overpriced or not.
The Lode one is selling Latex templates, and they even say "Users without LaTeX experience should budget for learning time or technical assistance." It's more of a low-cost self-serve alternative, which probably doesn't include everything a journal does to maintain visual consistency. We can argue that full-service is overpriced, sure, but this is different, like complaining about coffee shops because the vending machine is cheaper.
The Reddit link is about a book author with a pure text novel, possibly the optimal scenario for cheap type-setting.
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The svpow.com link was interesting, but, it seems like type-setting costs are usually bundled in (possibly to obscure overcharging, sure), so maybe it's better to critique the overall cost of academic publishing instead of trying to break out type-setting.
My $0.02, anyway.