Since many Europeans seem to be interested in limiting their exposure to US services I'm wondering if it would be a good idea to have an EU-based Mastodon instance that is privacy first and specifically set up to limit US instances in order to avoid people's posts from propagating too much on them (or at all). Call it Eurosk... Eurodon or something.
Another thing that might be useful is just guides for what what can be done and how for your account.