If anyone is doing this, they should expect a UDAAP claim at some point. I doubt you will find many posters here on BOL that are engaging in this practice, as it has been discussed, and discussed, and discussed numerous times as being unfair and deceptive.
To make a long story short, if you opt in a customer who has NO overdraft privilege just so you can charge a fee on inadvertant debit card transactions, you have a UDAAP. Period.
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I can't herd the cats anymore, so I just set up the electric fences and let them fry when they stray out of bounds.