adding layer 0 / network layer privacy projects
I suggest that you add layer 0 / network layer privacy projects to the list - all of them are at most "in the making" and not used in production but probably still relevant

- [Lokinet](https://lokinet.org/)
- [HOPR](https://hopr.network)
- [Elixxir](https://www.elixxir.io/)
- [nym](https://nymtech.net/)
- [Kovri](https://www.getmonero.org/resources/moneropedia/kovri.html): I2P for Monero (seems abandoned)