> These days, where basically nobody has a real ip, this is not entirely true.
This is a vast exaggeration. Although this is true for many and perhaps a majority, are there any publicly available stats regarding this, there are still a large number of ISPs which provide real ip addresses and allow incoming connections. My ISP serves several million customers across several US sates and provides real up addresses and allows incoming connections.
If you want to do so securely, use tailscale or wireguard, or any of a number of p2p vpns.
Awingu can do this. (https://www.awingu.com)
A Cloudflare Argo Tunnel, perhaps the free one for short-term use.
Even if so, configuring forwarding-only VPS costs ~3$/month.
These days, where basically nobody has a real ip, this is not entirely true. Using tor, you can easily expose a server to the outside world, the other point must support tor connections. Is there a way to freely expose anything to the outside world without needing special software on the client side?