I used to use the app, because you’d get a free drink every so often. But then I realized the app was stealing my money. Once I put $30 on the app only for it to show my balance as $28 and change (and I was not at zero when I loaded it). Another time I had $7-something showing on the app, bought my $4.50 latte, and was told I still owed $2 because the app was telling the scanner I only had $2.50.
Maybe it’s a glitch, but the cynic in me says they’re paying for the “free” drinks by Office-Spacing pennies out of my account every so often.