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As others also pointed out - Fedimint doesn't have fiat on it (at least initially), so you don't need hedging.
Just Hosted Channels do that, too. It was much of the guesswork to talk about stablecoins but I should mention that in the original interview they also talk about volatility. The very case of Fedimint is just straight way to tokes while Standard Sats practically eliminates tokes.
With StandardSats I believe you can at most block the sats, right? You can't withdraw all BTC from hosted channels that you are hosting, or can you?
Yes. There is exit-scam risk. Host may shut down node, close channels and thus taking user's sats.