There are a lot of Amentan countries. Vanda Nossëo representatives are dispatched to all of them. These Elves (two with black hair, one with silver) take a shuttle down from the lightleaper to a country called Calado, and radio ahead to request permission to land at a elegant modern spaceport.
And she walks them to the prison, which is right by the shuttleport for the convenience of visitors. The prison has a scanner for them to walk through that checks for dangerous magic things. Visitors wear a visitor badge.
Pregnant lady and her husband are hanging out in the main room looking at onesies on their computer. He's wearing a visitor badge.
"Oh. There aren't treaties about population size here, just about standards of living and things. If someone's population were growing so fast they were all starving and couldn't survive without ongoing external aid then there'd be an intervention for that population in particular but most places are doing just fine without rules so there's not much need to add them."
"We've gotten forty new colony planets off the ground since we joined!" says someone else cheerily. "Every idiot with a grand idea about how to run society was like 'I will found a planet that is Run Perfectly' and then they petitioned and if their grand idea was actually a lawful, safe place, whether it was a good idea or not, the petition usually went through so now we've got a place where the workers own the means of production and a place that's all tiny islands with Dunbar's number of people and a planet for the anarcho-capitalists and a planet for the orthodox Aratothalians and a planet where the whole place is under that truth effect the courts use and a planet that's mostly people resurrected from the 2200s..."