Something I miss in most of the fediverse communities is clarity in how the content published is protected or how it can be shared by third-parties. License definitions are usually missing in the different instances. For example, in my scholar.social profile I state the license for my toots.
However, I think instance-wide license terms should be defined and the software should allow that. From now on, for example, we have decided to use a CC-BY-ND 4.0 license in our Ecko instance. We have included a statement in the About section but I think it would be nice to have this license statement in the footer. Moreover, I think we should promote that the different communities clearly state under which license their publications are.