[Bopwoo]

It's a ridiculous question. Either they tested it or learned it from someone who knows how to do it. WHat kind of answer are you expecting?

Couldn’t someone just use the service and reverse engineer it?

Ref service rarely use some private unknown meth. They just use the usual meth everyone knows but people who are unsure or scared about doing it themselves pay someone else to do it.

Can’t those people who use the service see how the ref was done and then just do it themselves?