It's only ever happened to me twice, and both times it ended up being a somewhat positive experience.
First time, I was in college and I got a call from my bank (a local, tellers know your name style bank) that I had made a suspicious charge on my account. Unfortunately it was a debit card that was used to make the charge, so they couldn't reimburse me but they did tell me that it was made at Amazon. I checked my statement and called Amazon and they, without question, sent me a check (I think...this was some time ago) covering the difference.
Second time was a couple years ago, i got an alert from Capital One's app asking me to verify a suspicious charge. I've never spent more than maybe $100 on shoes, so buying $275 worth of shoes from the Nike site definitely wasn't me. Interestingly, Capital One reversed the charge, and then about a week later I received a merchant credit from Nike for the amount that was originally "stolen".