[neodymiumphish]

Except that the data they can review against everyone using prepaid cards can be consolidated into a database and reviewed. If 90% of these cards are used the same way, it's fair enough to assume you're using it in one of those ways. If they're wrong, meh, who cares?

[lrvick]

I only use prepaid cards on rare occasion when I encounter a bar or a parking meter that does not take cash. Regardless my name is not associated with any of those transactions.

In general cash raises the least eyebrows and is reasonably anonymous.