A paper-titled transaction seems like it should have one of the lowest chargeback risks. A copy of the purchase and sale specifying "as-is", plus signed title should be pretty clear cut evidence against a chargeback.

It's also not terribly surprising that someone who develops familiarity with one tool will then apply that tool to new situations. The main problem here is the ever-growing financial censorship regime / decommodification push that insists companies should be prying into their customers' business.