It's very exciting and I think it's inevitable for small communities around the globe to take commerce into their own hands. One thing that concerns me is the additional attack vector from the law. If a Fedimint group were to gain a lot of popularity I imagine that its growth would start compound. People would travel to a well established fedi to simply have a place to spend/buy/interact with bitcoiners. I know i would, it sounds like heaven.
However, now there is a head to cut off. We have seen in the past what governments will do to those who attempt to manage or create their own currency. With the Bitcoin network we know that there are many heads and if you really do start to chop at them your only result will be more heads (nodes) sprouting up all over the place. Perhaps it's due to my lack of understanding with Fediment but this is my worry. Not only could an entire micro economy be disrupted by attacking the source but the PR for Bitcoin afterwards would be bad as well.