I had a debit card saved on Aliexpress. The account was compromised by unknown means (maybe public wifi). Someone bought several $1,000+ phones from China that shipped to me in the US. I presume the sellers were in on it and were selling me unwanted inventory at inflated prices. Because they had tracking information, my bank (HSBC) said their hands were tied and I lost several thousand dollars overnight. It didn't matter that it was obviously fraud -- I provided customer service emails, logs showing the purchases all happened at 4am local time, and all at the exact same timestamp.
Moral of the story: don't use debit cards, don't save your cards online (save them in your browser and unselect "save this card"), don’t expect your bank to have effective fraud detection, and don't trust Aliexpress to have your back.