They could allow users to open Bitkey app in a spending mode as standard, where the users could only have access to the lightning balance, and with an option to access the long term saving balance by using the Bitkey device.
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Cashapp is custodial. Lightning with 
is non custodial and doesn't need to create channels or have inbound capacity.
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Personally, I would prefer to have my life savings (if I used Bitkey) separate from pocket money.
I don’t think the typical CashApp user cares too much about custodial vs non-custodial for LN and they likely don’t want to evade taxes, so using CashApp provides a better user experience. I don’t think the market needs another LN wallet, but if the demand is there CashApp will make one that’s noncustodial. I don’t see it happening tho.