[xg15]

Note that the IP address is shared with other PIs and there are restrictions on which ports you can use: https://examesh.de/en/docs/colocation/accessing-the-pi/

[YPPH]

That's a really big caveat - thanks for flagging it.

Looks like web hosting or a mail server is completely out of the question.

[tyingq]

I wonder why they wouldn't include direct ipv6 connectivity in addition to that proxy thing.