I have been noticing a lot of chargeback activity on prepaid cards lately. (this year) I used to allow them because even though they rarely rebill they also rarely charge back, so they improve your ratios - not so much anymore.
I have been blocking cloud hosting IP's VPN's and proxies for years but lately I use maxmind minifraud to check proxy score, no known proxies get through and a number of IP's I wouldn't previously have suspected are also blocked.
Nothing stops customers from being complete assholes and charging back "because they can" though.
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