I'll take it back. I tested and you're right: it was using the caller's account, not the person who owns the server. So it doesn't share your MJ credits in any way.

There must be a way of creating a Discord bot wrapper which holds your credentials, but on a quick search I wasn't able to find anything.

What a big bummer. That would be the ideal environment.

Oh interesting, I assumed their usage was counting towards my credits, but I actually didn't check, so maybe I'm wrong. Will test and report back.