I'd like to! It'd be pretty straightforward for the parts based on OpenStreetMap i.e. generating travel time areas / points of interest, I'd just need a bigger database. Ingesting global population & demographic data would be a bit of a bigger project since the site is built around US Census territory boundaries at the moment.

It'd definitely something I want to add, but since I'm quite limited in the time I spend on the project, I think it makes sense to keep it US-only for now. Thanks for trying it out!

I think the fun/hobbyist/urbanist answer is that people just like to know facts about where they live, I've spent hours now looking up different places' data. The more commercial answer if I were pitching this as a product is that 'who lives within X minutes of this point' is a big question in CRE site selection etc if e.g. you're deciding where to expand a franchise. The walk-time version is more of a fun demo of the engine than anything else.

Thanks for the feedback! The site (and I suppose this post) doesn't really do much to answer "what's the point?"