- Law Enforcement has been getting better at tracing and taking down markets, meaning the reputation systems keep getting reset and the authentic dealers are being arrested. Markets will get taken over by law enforcement and honeypotted, with BTC transactions being traced.
- Dealers and scammers have multiple aliases, sometimes even in the same market. One common strategy is to sell high quality product until a modest reputation is built on one alias, and then to 'cash out' by switching to cut junk or getting people to finalize escrow early and just not deliver. Wash, rinse, repeat with multiple aliases in parallel. It's so common it's called the exit scam.
- I've also seen firsthand some people get threats from dealers on tor forums, because they left negative reviews. Keep in mind the dealer has an idea where you live, but you have no idea who they are. You also don't know if the dealer has another alias that is going to cut your product with fentanyl, RCs, or rat poison next time because they recognize your delivery address.