Your entire response is so inaccurate that I don't even know where to begin to answer you or if I should even do it.
A fraud on my debit card at my usual bank led me to having to go to the branch, make a written complaint, provide evidence of the fraud and wait a month for the bank to resolve it. I solved the same situation with my Revolut card online with the App, by simply searching for the transaction and marking it as "fraudulent". They automatically refunded my money, cancelled my card and sent me a new one for free.
I started using the Revolut card when I saw that the exchange rate for cards abroad was 10% higher. Specifically, making a payment in Moscow with the ruble at 70 against the euro, my bank charged me 63. If I look right now at the exchange rate of my bank's VISA card against the baht it gives me 32, when right now the official exchange rate is 36.
The Revolut and N26 cards are debit cards and are not associated with my bank account, so you have to refill them every time and they can never charge more than the balance that is in it at that moment. On a credit card they can charge you the limit of the card and that is thousands of euros.
Online single-use cards are automatically cancelled every time you use them and a new one is generated for you, so even if they copy your data when making a purchase, if they later try to charge that card they find that it is already cancelled.
The thing is that these cards are only available to citizens of the European Union.