I’m registered with lemmy.zip, but I commented on a post in lemmy.world and it won’t seem to show up in the post, although it does show up in my comments list. Do some instances(?) block comments from other instances? Or is this a sub(?) thing?
I’m a pretty new reddifugee and still trying to get the hang of this. Feel free to correct my terminology, please.

Is doing above only for lemmy instance admins? Or is this for regular users? Thank you for the extensive write up, btw.
For regular users.