Fedimint is custodial so theft is always a possibility. It's important for users to choose guardians who are least likely to collude and steal.
Federated statechain (https://github.com/fedimint/fedimint/issues/585) doesn't really help prevent theft, but it would allow users to get their bitcoin out if the federation shut down permanently for some reason.
What about locking the guardian funds for longer times - is that not possible? I.e. what about using some PTLC type of scheme that guardians can spend only with some delay and some supermajority of users could "outvote" them if they collaboratively spend before?
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