Having worked in payment systems and processing, I'm well aware of the interchange fees and other fees.

However, the specific name for the cohort of users who paid a very small percentage of their spend (including 0%) was indeed "deadbeat" (at least in the two data warehouses I helped build out), as I'm less profitable than others with less spend.

In fact, one issuer (Capital One) actually closed a card I regularly used (~$1000/year annual spend) about 2 years ago, the letter not stating reasons why. I actually called customer service, and they cited that the costs to maintain my account was considered too high. I used them for a specific category of transactions in which the rewards were higher than any other card I had. Though my usage was apparently insufficient to make it worthwhile keeping me as a customer.