I imagine for visa it doesn't matter if it buys the correct item, all it matters is that it starts making loads of transactions.

Will be interesting when the scammers figure out how to get it to buy something that a human would obviously notice to be a scam.

I spend a lot of time looking out for undervalued products on eBay and sniping auctions. It is quite laborious. I imagine it would be most useful in this sort of shopping. Or buying tickets the second they become available, or tracking sites for cheapest air fare or hotels and completing the transaction on those sorts of things.

I don't advocate using it. I wouldn't want to. But I imagine people will use it a lot for things like this.