Yeah, the core ideas sound great, but if the only way code can be published and imported is via their cloud platform, that would be a hard pass for me.
Glancing at their docs, I see mentions of Unison Share, which is also hosted on unison-lang.org.
So I would appreciate this being clarified upfront in all their marketing and documentation.
Ah, I do see the BYOC option you mention. It still requires a unison.cloud account and an active subscription, though...