Thats to build the server, any you are basically building the data for hosting approximately Google Maps for the entire planet here so seems relatively small really.

It’ll do it on what is basically a beefy dev machine. You can host a single city with less.

Also the requirements are for build not hosting. And can be reduced by using ZFS. Apparently.

To use the map in the browser requires nothing special.

Headway maintainer here. You don't need 10T of nvme storage unless you want to try and build tiles, a routing graph and a search index for the full planet without using a deduplicated filesystem. Eventually I hope to eliminate the need for deduplication but that's not currently a huge priority, since most Headway users don't run full-planet instances anyway. To my knowledge I'm the only one who does. Most people just run a smaller instance for their city.

It's not the same as OsmAnd obviously because it runs in the browser but it does try to fill the same niche. Also 64G of RAM for building the planet is a tiny machine! We don't know how good we have it these days. This used to be completely intractable for mere mortals. :)