There are tons more. The basic philosophy is that they use a bunch of social engineering techniques that are specific to companies and use them to get refund for people and then take a cut (usually 20-35%). The likely picked up these techniques through trial and error or from other people running similar services. Their most common targets are amazon, PayPal, almost all electronics retailers, tons of clothing companies, Walmart, target, Costco, etc.
what do you think the police are for? the FBI also investigates wire fraud cases. unfortunately both do not have enough resources to investigate $200 frauds. Hell, in some jurisdictions they don't even bother with $900 thefts.
But I'm not sure it's good to stop expecting the police to deal with this. That sort of surrender to criminality would be a dark step for humanity.
General beatdowns. Detectives are what you're thinking of. Most people want detectives, few people want harassment and fines (or death) over nothing more than some cop's power trip or petty things (like jay walking when it blocks no traffic and is completely safe).
Granted, this perspective is colored by American policing. I know some other countries have it better.
Not trying to excuse anything, just explain why some people are getting crappy used products (sloppy returns QA) or aggressive customer services denying consumer rights (burnt retailer). Ultimately it's all on the retailer, but it's also a cost we'll end up bearing.
Criminals ruin things for everyone.