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You have a risk that wallet of satoshi just stops working/banned from App Store(unlikely).
Unlikely that it happens in the next hour? yes. Unlikely that it happens in the next month? maybe yes Unlikely that it happens in one year? a bit more likely Unlikely that it happens in 5 years? I'd say likely How about 10 years? quite likely I'd say.
The longer you go back in time the less likely you find a custodial service that has not rugged their customers actually. Just keep that in mind and don't sleep at the wheel.