I do think this will be both your biggest success and your biggest mistake. Signal is less metadata resistant than SimpleX, so it will lock in Bitcoiners to Signal. With Breeze it's a custodial model that will give insights into payment flows.

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The Breez + Spark SDK isn't custodial. Spark is a sidechain that does real time submarine swaps for Lightning so the user doesn't have to deal with managing channels and liquidity, so it's not strictly speaking a "true Lightning wallet", but it's not custodial. You hold the keys.