Would it be possible for me to make comments to other instances etc?
Solved: I can’t, it would only work with a public domain.
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Doesn’t work if you are on CGNAT
See: Anything that can open ports. NAT of any kind tends to not allow opening ports.
Absolutely. However I feel like the whole thread needs extra clarification, considering the question OP posed.
Dynamic DNS isn’t a magic wand in the way a Reverse Proxy over VPN is.
Yea, that is also what I thought. To bypass this, you would need something like Cloudflare Tunnels or setup a VPN on a VPS, that redirects traffic to your homeserver.