well i retire the term fascist, was a bit exagerated, but in years of dealing by internet, here and on other place,for dozens of dozens transactions, i never had any problem.
but, even if each case was different, i never make deals without some kind of assurance.
i often use paypal. sometimes i asked copy of official paper coresponding to the address. one time i asked the seller to send me the psu, and paid only when i had it. i asked question, test the guy. and of course it’s more easy if the name is familiar to me. i prefer deals in my country, even if a bit expensive ( i am not on rare things too…)
the guy sell an unit but never asked question on it?? …

i mean i don’t see a reason to lock anithing, internet is a jungle, we all know that.
so being prudent is the first and only rule to me.