Would you call phoenix wallet noncustodial? Your funds are on channels from their server. The seed you get is a emergency wallet where your funds get transferred to.
Funds are fully controlled by your seed. You can anytime, restore it into an Electrum wallet, closing the remaining channels. https://phoenix.acinq.co/faq#my-channels-got-force-closed-how-do-i-recover-my-money https://phoenix.acinq.co/faq#what-happens-if-acinq-disappears
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