While true, people seem to pretty immediately get it once it’s clear where to see the source instance. If they care, they’re usually surprised, and then the reason magazines on different instances are different makes sense.
I’m not sure what there is to do about it, the impression that there is one magazine is a relic of centralization, all there is to do is explain that it is not the case when people are inevitably confused. I hate simplifying it to “bob@microsoft.com and bob@apple.com are different people” because I know it feels more complicated than that but it seems like it doesn’t take that long to click honestly.
Best I figure is to have welcoming communities that don’t turn into asshats if someone is confused or asks questions. This doesn’t seem like something you can force people to understand before they run into a problem and try to figure out what’s going on. Eventually there will be an AI bot that answers questions I’m sure…!
Can’t control when you do it.