You know it isn’t true, ever since they started requiring a CLA.
LXD is literally less free than proxmox, looking at those terms, since Canonical isn’t required to open source any custom lxd versions they host.
LXD was forked into Incus (before the CLA took effect) and is now developed under the Linux Containers umbrella as Apache 2.0. From the link:
Incus is a true open source community project, free of any CLA and remains released under the Apache 2.0 license. It’s maintained by the same team of developers that first created LXD.
The only reason why I wrote LXD/Incus is because on Debian 12 you can get it from the repositories as LXD and the roadmap is to eventually replace it with Incus. Both the Debian maintainers and Incus team are working on this transition and have expressed their guarantee that whenever a Debian version comes out with the replacement it will upgrade automatically without incompatibilities or breaking changes - after all the current Debian version is before the CLA took place and is compatible with the Incus code.
At this point, for anyone running Debian 12, you can’t say “go get Incus” as it will just cause confusion and require an extra repository. You’ve to say “go get LXD from the repository” and they’ll eventually get updated to Incus without breaking their setup later.