A few reasons. For starters, a lot of vendors have experienced chargebacks from customers. There are documented cases all over the internet peptide space of people using PayPal to order product, getting impatient with the slow pace of delivery and initiating a chargeback. Then getting the product, so the vendor literally got ripped off. Unscrupulous scammer customers have also done it with no intention of paying for the product in the first place. And being the gray market, the vendor has no recourse. It's not like they can go to PayPal and say "hey, I want to dispute this chargeback because I actually did deliver these illegal meds that violate PayPal terms of service...". PayPal is also regulated by law so vendors are at risk of getting their accounts shut down, increased scrutiny from the authorities, etc. Crypto is just a lot safer for them overall, and also protects the consumer. I for one don't want to have a traceable log of my money going to a gray market tirzepatide purchase if EL gets my vendor's transaction record from the Chinese government and decides to start suing individual consumers.... Remote chance, yes. But total anonymity is a good thing in my opinion.