[gene-h]

Entertainingly, Alexa supports purchasing music, so one could release a song on Amazon music with audio that triggers Alexa to buy it.

[lsaferite]

Mine requires a PIN to purchase.

[KMag]

Whom are you fooling? There's a 50/50 chance your PIN is the same as the combination I use on my luggage. And if the PIN is also by voice, a picking a popular PIN will bypass the check for a good fraction of users, particularly if you get 3 tries or something.