The you co-locate to the first world. Or somewhere that can get a data center built with resources that you trust.
I ran data centers for a living in Northern VA and had all sorts of international clients. Egyptian schools who rented servers, Brazilian Protestant ministries who shipped servers to us, etc. There were some decent data centers in Mumbai we had to get VPNs built for, and we had a least one legit client in Lagos, Nigeria.
3rd world perspective: They're not far off from the mark.
You'd want to co-locate with ISP who already has infrastructure for continuous services through blackouts et al, or you could have a datacenter if it's small-ish, because you already have some infrastructure to keep operating during blackouts.
I believe you are saying that some countries don't have data centers where you can co-locate. Most of the places where AWS has a datacenter have other datacenter companies that offer co-location.
I think you'll struggle to find any place without a few datacenters nearby, at least in a neighboring country. Of course it's going to be a bit further away if you're in central Africa.
Even then, you can colocate in a datacenter anywhere you want, have equipment delivered there and pay remote hands to install it for you for a very reasonable fee.
Of course this doesn't make sense if you just want a small webserver, but that's not who we are talking about here.
I ran data centers for a living in Northern VA and had all sorts of international clients. Egyptian schools who rented servers, Brazilian Protestant ministries who shipped servers to us, etc. There were some decent data centers in Mumbai we had to get VPNs built for, and we had a least one legit client in Lagos, Nigeria.