I have got an email from Revolut few days ago:
"Top-up your Revolut account in Czech Koruna!
We have some awesome news - you can now top up your Revolut account in Czech Koruna! To celebrate, we’re giving away free Revolut cards in Prague on the 18th October. Come along and bring your friends and family!"
So, now I am trying to find CZK in the list of top-up currencies in app. But CZK are not listed there! It was a joke from Revolut?