We’re all figuring this out as we go! Since the great Reddit migration, we’ve already seen our first big drama with the Beehaw defederation. Some Beehaw users disagreed and left for other instances while users of other instances liked the move and joined Beehaw. The Lemmy fediverse is what WE make it for better or for worse.
When releasing art, I recommend using a Creative Commons license such as “CC BY 4.0”. They have a license chooser you can use.