If I understand correctly, the mint can never de-anonymize you based on the info you have to give them.
You may slip up and give them extra info, but @tony can correct me.
Discussion
But say the IRS comes in and they're like, "this is the price you pay to run this fedimint, you guys owe us xyz" blah blah blah. I guess the guardians wouldn't know who's bitcoin they're giving away.. but would the IRS care? I guess nothing would stop everyone in the fedimint from moving their money to another fedimint if they caught wind of something like this going down. Honestly, the more I work through this scenario the better I feel.