I had a run on my account one morning. I do not know how my card was compromised, but I had 100+ fraudulent charges in 3 mins one morning paid to Google *Youtube. I froze the card while all but one transaction were pending, submitted a claim through the app to try to stop them.
They refunded most of it, but I'm still going through the process of getting back the rest of my money. Its a nightmare dealing with the claims department or whoever. No one to call, only an email response when they feel like it. Very sad.