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If I send BTC to my Fold account, sell that BTC for cash, can I spend that cash quickly on a debit card?
Yes. But you better remember the cost basis you acquired that bitcoin at when you sent it to fold. They will report that sell to the IRS and if you don’t know you will owe taxes on the capital gain.
Or withdrawal it from an ATM?
Yup you can. Just need an card and pin. I did it before but paid a large ATM fee.
What's the settlement/confirmation time for that
Depends on how busy the mempool is.
What else is possible?
ACH awards. Earn Sats back on every single major bill that you can pay with a bank account and routing number. So you could supercharge your stacking this way