In case someone like me finds this thread through a Google search – I just got back from Prague and using Revolut there was a hit or miss when it comes to ATMs.
Euronet – notified me of a 75 CZK (or 95, can’t be sure) fee, regardless of the amount withdrawn. Some Euronet ATMs flat out rejected my card (and my gf’s Revolut card as well).
CSOB – didn’t notify me about any fees, but when I tried withdrawing 1000 CZK (I had 2000 CZK in my account at that point), it said I had insufficient funds on my account…
Raiffeisen – worked okay at first, without any fees, but then started converting the amount to PLN (my primary currency) and then back to CZK. So when I withdrew 200 CZK it charged my account 204,14 CZK. Very strange.
KB – worked without issues.