I believe $1K/person is more than enough for great living (including a humble but nice room rent) in the majority of countries (including a number of the EU members, let alone the "third world").
I strongly suspect I could get down to 500$ , but I don't want to push it.
I'll note this is not correct. I'm in Morgantown WV and the Internet is great. I'm paying in the low $30s for 200mbps with normal low latency and it's highly reliable, via Comcast. That'll go on up to 1.2gbps if I need it. Speedtest usually comes out to 180-230mbps depending on the test site.
Most populated areas of West Virginia offer typical Comcast-style Internet speeds and prices. If you're living in the middle of nowhere, or a town of 2000 people, it's true that may be a different story. Starlink and local cable providers are your only serious options then.