Communities on Lemmy follow the rules of the community, and the instance that hosts that community. So, this would need to follow the rules of [email protected] and dbzer0, the instance that left memes is hosted on.

Both of these can be found in the sidebar on the main page of the community, aka [email protected].

There are also some instances that will ban you for your comments/posts in other communities, but that’s not common for most places that you would want to post anyway, or unless you post something very awful.