Thank you for your suggestion!
Yes, we plan to support overlay networks. For example, for inter-network traffic between email servers. We have also successfully conducted experiments on encapsulating ActivityPub traffic in Yggdrasil. It is unlikely to be Tor due to its strong association with criminal activity.
Possible future use cases:
- Inter-server interaction. Mail from alice@alice.org to bob@bob.org will go through the ygg tunnel. This will prevent a person from observing in the middle. We wanted to do the same with ActivityPub, but it is strongly tied to httpS.
- Access to a closed perimeter. A mode in which SP services only go out to the ygg network, and an ygg client will need to be installed for access. This will likely be Nebula.
i2p is slow, but it may be sufficient for SMTP/ActivityPub traffic.
However, overlay networks are not a top priority right now. Automated resource management and disk encryption are more important.