@Elisee, did you think of a global sync or just "go fetch my conf on this server" ?
Basically, some Superpowers users will regularly hop onto various servers. It would be a nice thing to let them use their profile and preferences everywhere without any manual intervention (or as little as possible).
Obviously with the hypothesis that a SupServ will not handle 10k+ different users. Saving everybody's config could become heavy.
That sounds like a very reasonable hypothesis to me. I think it is OK to think of the Superpowers server as designed to host maybe a few dozens of users at once, not more. That design goal can always change later if we come up with a reason to do so.
I've written up a design proposal on GitHub, feedback wanted! https://github.com/superpowers/superpowers/issues/55