Note that I had a balance on Revolut even before that transfer, which they don't bother mentioning.
So 15 ETH lost, and more than 3000 EUR lost as well, plus the previous balance, + time lost, + stress, + lawyer costs.
After searching their message on Google, it seems that I'm not the only victim of this business practice. I'm obviously sueing; wish me normality (therefore not luck, because I shouldn't need luck to get my money back + damages)!
Do not use Revolut!