I don't think this problem exists or is big enough to worry about because the rolling jubilee approach only permits moral hazard once every 7 years due to credit scoring.
To be able to rack up significant debt, one much have great credit for several years in a row so that your line of credit can be expanded upon year after year. I reckon it takes 3-7 years to be able to get to a credit line of $30k because you choose to default. In that time, the creditor is likely to make a bunch of money on that assuming you maintain rolling debt because of interest in the interim. Only in the case where you keep upping your credit line, but don't use any of the money until you plan on sucking it dry to you maximize the take on a scheme like this. Even then you get at most $30k and then have to wait another 10-12 years to be able to try that scheme again.
To be able to rack up significant debt, one much have great credit for several years in a row so that your line of credit can be expanded upon year after year. I reckon it takes 3-7 years to be able to get to a credit line of $30k because you choose to default. In that time, the creditor is likely to make a bunch of money on that assuming you maintain rolling debt because of interest in the interim. Only in the case where you keep upping your credit line, but don't use any of the money until you plan on sucking it dry to you maximize the take on a scheme like this. Even then you get at most $30k and then have to wait another 10-12 years to be able to try that scheme again.