After Silk Road 13 years ago
The silk road did work like an escrow where SR would hold the bitcoins until the buyer finalized (FE for short). Bitcoin would have an internal tumbler that would generate multiple addresses and would make it difficult to track the transactions.
Most vendors would ask for early FE or no product would be shipped but that was too risky for most buyers. FE was supposed to occur when the buyer received the product and gave it thumbs up.