I dealt with millions of dollars in chargebacks with Stripe. We sold tickets, they're easy to re-sell and our customers were tourists visiting shows from all over the world.

Stripe Radar was not a good product. It would score large numbers of very suspect transactions at a risk level of 1 or 2 (out of 100). I don't have an ML background, but something about their methodology was just flawed. It behaved as if there was a wire loose in it. Unfortunately, I don't think they're very incentivized to care.