Depends. Why can't banks offer more debit cards to more people and, I don't know, stop honoring overdrafts? Transactions should decline, not overdraft, even with overdraft off.
We've built lots of traps for people that have balances near-zero that keep them near zero, and one little mistake snowballs into blacklists from Telecheck, ChexSystems, and other fun companies.
Meanwhile once you can keep your balance with at least three significant zeros in it, the bank will be happy to shower you back in rewards and cashback, ripped away from the fees and interest levied to the poor.
Bank of America had a class action against them because they would reorder transactions to make you overdraft.
For example, when I was relatively poor and near 0 balance in like 2009 era I’d wait for my direct deposit to come so I could grocery shop and pay bills.
When it deposited, the funds would become available to use even though the transaction wasn’t cleared, pretty normal so far.
So say you pay 2 bills and grocery shop, come back on Monday and you’d see that your pending deposit vanished, 3 transactions cleared for 3 overdrafts, then your deposit cleared afterward.
This is just one that I know about because it happened to me. I wonder how many less blatant scams like this exist that most people aren’t even aware of.