I think that's the whole point -- we don't know.
That's historic. Gas stations wouldn't be allowed nowadays, and the legal ways to buy something that dangerous would certainly not be anonymous
To charge my electric car recently on holiday I couldn't just swipe my card at the charger like I can with a self-serve gas station. I had to download some shonky app, sign up, provide address details, and agree to pages of restrictions.
Even more amusing was Douglas Crockford putting a clause in his software license saying it may not be used "for evil". A bit of tongue-in-cheek humor referencing George Bush, but actually ended up causing a bit of a headache for some orgs, and the GNU Project declaring it a non-free license [2]
[1] https://www.apple.com/legal/internet-services/itunes/dev/std...
[2] https://en.wikipedia.org/wiki/Douglas_Crockford#Software_lic...