> Likewise, people have different understandings of what exactly FOSS means and I'm not deeply familiar with the BSL, so I'm not sure whether it would meet your needs.

https://mariadb.com/bsl11/

> The Business Source License (this document, or the “License”) is not an Open Source license.

I'm gonna take them at their word.

> Best of luck in your search! Maybe take a look at Tinc or Yggdrasil.

I did, but thanks:)