More or less a security nightmare than a drawer or tray full of physical credit cards behind a busy bar at night, which is the alternative at US bars? I'd argue that time-shifting card data is actually safer, even if it is often against the merchant agreement.
I really haven't heard of much trouble caused by these systems - of course, they require magnetic stripes in general, which are a massive attack vector, but the bar use case specifically doesn't seem to cause additional issues that I'm aware of. There are so many lower-tech and easy ways to steal magnetic track data, like skimmers, that I don't think compromising bar-back point of sale systems is a particularly high priority for most criminals.
Anyway, this is probably just a small snapshot in time regardless, since once swiped-card transactions finally go away US bars will have to switch to the mobile terminal pay-as-you-go method anyway.
I really haven't heard of much trouble caused by these systems - of course, they require magnetic stripes in general, which are a massive attack vector, but the bar use case specifically doesn't seem to cause additional issues that I'm aware of. There are so many lower-tech and easy ways to steal magnetic track data, like skimmers, that I don't think compromising bar-back point of sale systems is a particularly high priority for most criminals.
Anyway, this is probably just a small snapshot in time regardless, since once swiped-card transactions finally go away US bars will have to switch to the mobile terminal pay-as-you-go method anyway.