https://urbit.org/blog/common-objections-to-urbit/#planet > Urbit doesn't have enough planets for every human > A 32-bit planet is a tool, not a toy. Like a car, it's a device for a responsible and independent adult. There aren't 4 billion cars in the world, nor 4 billion independent adults. > If you aren't an independent adult, and you don't need or even shouldn't have unconditional digital freedom (no one's 8-year-…
If they had picked e.g. 10 billion, then the population would still eventually (all going well) rise above that. If they had picked some number so large there would never be that many humans (or if there were, we'd need new networking solutions anyway), it would defeat the point of identity scarcity. And the whole 'disincentivizing trolling' idea had better damn work during the early phases of the network, when adoption is most important, or you risk the whole thing burning when it didn't need to.
The motivations are, of course, still suspect.