How does Worldcoin plan to solve for people in wealthier countries not wanting to scan their eyeballs (because the UBI isn't meaningful enough)?

Likely through a long tail of value props beyond the financial incentive 

For example, apps that require proof of personhood to use them, or voting schemes that require you to verify as a unique human 

Also early adoption of new technology often happens in developed countries b/c it is seen as high status

Building /bright-moments - minting onchain art IRL | /purple #15 | FID 129 #magikarp

What historical technology have been adopted in developing countries and then become the norm and high status in developed countries?

"historical" is a stretch but these guys started in Africa due to regulatory hurdles in the US:

https://www.flyzipline.com

still largely built in half-moon bay, though.

Kindness, wisdom, and health. CTO @ truemed.com | @coinbase | @dropbox | gazzini.com

Where did they first see adoption of their technology?

I know the founder! 100% developed world company :)