I was in a similar situation as well. Based on my conversation with the support staff, it seems like they are not allowed to access customer information without the transaction ID. At least unmigrated Minecraft account still works, despite them saying they wouldn't be accessible after March.
To clarify, UDP is not currently supported, but I intend to support it in the future. Incoming ICMP should be completely dropped, and outgoing ICMP is not supported.
I made it because my friends and I use wireguard to have a private network, and they don't feel comfortable running a ssh server on their machines. It can also be used with a vpn provider like Mullvad without setting up a new nic or requiring special privs.