As someone who has recently started seeding as much as I can, this is a great question to which I don't have the answer.
I am not renewing my Proton yearly subscription after it ends due to recent developments. They seem to be the only "big name" VPN with the port forwarding feature. I heard of OpenVPN, but have not had a chance to dig into it too much.
My ISP does not provide IPV6 support, so this will be pretty important to sort out soon.
The whole reason the manosphere is easy to get into is because it is, on the surface, one of the most welcoming and validating spaces for men to be in. Thanks for giving attention to that with your comment.