We do pay people to have kids in the USA - once you're on welfare. Your WIC and EBT allowances go up per kid.

And even if you're not that poor, you get subsidized kids through things like the earned income tax credit and the child tax credit. It's annoying that while some of those support 3+ kids, many "top out" at three and stop increasing.

I've often thought of searching for "sponsorships" for additional children (though we'd probably have them anyway) - not sure I want my son to be named Facebook X AI though ;)