These numbers are actually kinda interesting, in that they're based on user location, not advertiser. So basically all global companies target the US first because it's a big market with consistent regulations and mostly one language (compare to the EU where you'd need English/German/French/Spanish/Polish and still would miss a lot).

So, those numbers reflect a capital inflow to the US market rather than (as many people think) absurdly high conversion US users.

Meta stopped reporting user numbers/CPMs by geography after the market freaked out when user growth plateaued in the US (because they'd acquired basically everyone).