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What are legitimate use case to use port-forwarding behind a VPN IP? Genuinely curious, I'm not implying anything. The main use-case is hosting something for which you don't want to reveal your IP or circumvent some ISP that block hosting web servers on their residential IPs. I'm sure I'm missing many more use cases.

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Can be used for hosting libgen/sci-hub.

Basically you have a thin proxy on some not so cheap but ‘anonymous’ Bitcoin payed VM, that then (http) links to your vpn endpoint.

You need the dual setup as using the btc vm for storage of terabytes of data as well as for TB of traffic is too expensive for a volunteer run project.

I have been out of the loop for a while on this, but doesn't BitTorrent require you to set up a port forward? Otherwise you can only connect to peers that do, but not other peers that don't.

I think it is possible to connect using STUN even if both users are behind NAT.

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