Last week I ordered some shoe insoles on Amazon. I usually get these at the Dollar Store, and tried to buy them there, but there were out, as they often are. They're $2/pair at DS.
I found some on Amazon, 3 pair for $6, so did a Subscribe & Save for every 3 months. It setup the delivery for November, which I didn't notice.
Today I did notice that it was setup for November and changed it to September. The price was $9+ but changed to $10+. When I changed the delivery back to September, it was still $10+. WTF? I looked at the original order and it said $6.
IMO, if someone sets up a S&S order and the price changes, the S&S should automatically be suspended, an email sent, and the buyer has to re-enable the S&S at the new price.
I don't have many S&S items, but I'll be scrutinizing them more closely from now on.
That said, Amazon is the Facebook of Walmarts and you should expect an adversarial relationship. My strategy is to occasionally order something I don’t want and then return it just to chip away at their bottom line. Petty and ineffective, you say? That’s my brand.