Lots of fraudulent transactions targeting users in Portugal

Lots of fraudulent transactions targeting users in Portugal (as per reports on Social Media). See images posted by users:

I have receveid an new physical Revolut Card (Visa) in June.

I did the follwoing:

Paid once with a Slot Card reader and PIN to activate the card.

Paid once a book order with amazon.com

One day later I was asked by the Revolut App
if I had maid a payment with Uber (0.99 EUR), which I never did,

I just could confirm NO and
the brandnew card was desactivated.

Now I wonder, how is Uber able to abuse my card?