Definitely interesting to us.
@sdeziel and myself run a small-ish cloud based on LXD for a non-profit and its partners. Only a few hundred instances at this point though but running on top of OVN and Ceph, all on recent AMD Epyc with a good chunk of CPU, RAM and storage on each compute node.
It’s been working quite well so far, creating projects for each individual user or group of users and using restrictions to give them a limited mount of resources and access to the cluster.