A tool for bypass CGNAT?

Disclaimer: a link will follow, it’s a link of a company which is promoting itself as service provider, for payed services. I do not have any kind of relationship with this company, I read the advertising and I find this interesting for the community.
I’m not endorsing or supporting this company in any way

https://ipv6.rs/

Behind this domain there is an American company, in Wyoming. Has not “that easy” to get to some “real data”

IPv6rs Limited Company: Legal
1309 Coffeen Avenue STE 1200
Sheridan, Wyoming 82801

I toyed a bit with Maps, seems a small building.
They do provide a “way” to help self hosters without a direct access to public IP address.

They have public source of the project

On some way, this might be interesting… however.
Is there any kind of competitor/similar product or project? Without needin external services…

I recall reading some article talking about using TailScale/headscale to bypass CGNAT. Probably also achievable with ZeroTier, WireGuard, or some paid VPN services that offer port forwarding, cloudflared tunnels, netmaker… To make some internal service reachable (but depending on implementation not exclusively through IPv6).
https://www.reddit.com/r/selfhosted/comments/1bm5h2y/a_self_hosted_ipv6_tunnel_broker_like_he/

A good starting point to research: