If I was logged into several instances at once in the client and seeing the composite feed and then could choose instance when replying or posting (with some set default, like from: field in e-mail clients) lemmy.world could ban piracy all it wants and it’d still be in my feed without me having to leave it or change instances.
Maybe a digital signature of some kind to copy and paste from one account to another, or account to account import/export of the subscribe list.